I received my Bachelor of Arts in 1985 from the University of California, San Diego, with a major in Animal Physiology. I reecived my Doctorate of Veterinary Medicine (Food Animal emphasis) in 1990 from the University of California, Davis, and in 1991 I received a Master of Preventive Veterinary Medicine (Herd Health emphasis) from the Department of Epidemiology and Preventive Medicine, University of California, Davis. I continued my studies in Epidemiology and Infectious Diseases at Cornell University where I received a Ph.D. in 1994.  I chose UC Davis as my academic institution since it had a very compelling and forward-thinking faculty position open when I was in the job market.  I participate in the GGE since my primary mode of generating scientific inferences is through both analytical epidemiology and the application of quantitive microbiology within a risk assessment framework.

Updated 7/20/00

Publications:

Referenecd Journals & Proceedings

1. 1992 Atwill, E.R., H.O. Mohammed, E.J. Dubovi, and J.W. Lopez.  Retrospective evaluation of factors associated with the risk of seropositivity to Ehrlichia risticii in horses in New York state.  American Journal of Veterinary Research 53(10):1931-1934.

2. 1993 Atwill, E.R., L.L. Rodriguez, D.W. Hird, and O. Rojas.  Environmental and host factors associated with seropositivity to New Jersey and Indiana vesicular stomatitis viruses in Costa Rican cattle.  Preventive Veterinary Medicine 15:303-314.

3. 1994 Atwill, E.R., H.O. Mohammed and R. de la Rua-Domenech.  Geographical variation of seropositivity to Ehrlichia risticii (equine monocytic ehrlichiosis) of horses in New York state.  Equine Veterinary Journal 26(2):143-147.

4. 1994 Atwill, E.R. and H.O. Mohammed.  Epidemiologic studies on equine monocytic ehrlichiosis in New York state.  Proceedings of the 39th Annual Convention of the American Association of Equine Practitioners.  San Antonio, Texas. pp. 269-270 (peer reviewed)

5. 1995 Atwill, E.R. and H.O. Mohammed. Estimates of the annual incidence density and financial losses of equine monocytic ehrlichiosis in New York state. Preventive Veterinary Medicine 23 (1-2):41-52.

6. 1995 Atwill, E.R., H.O. Mohammed, J. Scarlett, C.E. McCulloch. Extending the interpretation and utility of mixed effects logistic regression models. Preventive Veterinary Medicine 24 (3):187-201.

7. 1995 de la Rúa-Domènech, R., H.O. Mohammed, E.R. Atwill, J.F. Cummings, T.J. Divers, and A. de Lahunta. Epidemiologic evidence for clustering of equine motor neuron disease in the US. American Journal of Veterinary Research 56 (11): 1433-1439.

8. 1995 Crouse, S.J., E.R. Atwill, M. Lagana, and K.A. Houpt. Soft surfaces: a factor in feline psychological well-being. Contemporary Topics in Laboratory Animal Science 34(6): 94-97.

9. 1996 Atwill, E.R. Assessing the link between rangeland cattle and waterborne Cryptosporidium parvum infection in humans. Rangelands 18(2): 48-51.

10. 1996 Atwill, E.R., H.O. Mohammed, and J.W. Lopez. An evaluation of travel and use as a risk factor for seropositivity to Ehrlichia risticii in horses of New York state. American Journal of Veterinary Research 57(3): 273-277.

11. 1996 Atwill, E.R., H.O. Mohammed, J.W. Lopez, C.E. McCulloch, and E.J. Dubovi. Cross-sectional evaluation of environmental, host, and management factors associated with risk of seropositivity to Ehrlichia risticii in horses of New York state. American Journal of Veterinary Research 57(3): 278-285.

12. 1996 Atwill, E.R. and H.O. Mohammed.  Evaluation of vaccination of horses as a strategy to control equine monocytic ehrlichiosis. Journal of American Veterinary Medical Association 208(8): 1290-1294.

13. 1996 Atwill, E.R. and H.O. Mohammed. Benefit-cost analysis of vaccination of horses as a strategy  to control equine monocytic ehrlichiosis. Journal of American Veterinary Medical Association 208(8): 1295-1299.

14. 1996 Harp, J.A., P. Jardon, E.R. Atwill, M. Zylstra, S. Checal, J.P. Goff, C.D. Simone. Field testing of prophylactic measures against Cryptosporidium parvum infection in calves in a California dairy herd. American Journal of Veterinary Research 57(11): 1586-1588.

15. 1997  Johnson, E., E.R. Atwill, M.E. Filkins, and J. Kalush. The prevalence of shedding of Cryptosporidium and Giardia sp. based on a single fecal sample collection from each of 91 horses used for backcountry recreation. Journal of Veterinary Diagnostic Investigation 9: 56-60.

16. 1997 Atwill, E.R., R.A. Sweitzer, M. Das Graças C. Pereira, I.A. Gardner, D. Van Vuren, W.M. Boyce. Prevalence of and associated risk factors for shedding Cryptosporidium parvum and Giardia within feral pig populations in California. Applied and Environmental Microbiology 63(10): 3946-3949.

17. 1997 Cliver, D.O. and E.R. Atwill. Research and reason can minimize foodborne and waterborne illness. California Agriculture 51(2): 8-14.

18. 1998 Jeffrey, J.S., J.H. Kirk, E.R. Atwill, J.S. Cullor. Prevalence of selected microbial pathogens in processed poultry waste used as Dairy feed. Poultry Science Journal 77: 808-811.

19.   1998  Bray, R.E., S.J. Wickler, E.A. Cogger, E.R. Atwill, C. London, J.L. Callino, T.P.
Anderson. Endoparasite infection and Cryptosporidium/Giardia in feral horses on public lands. Journal of Equine Veterinary Science
18(1): 41-43.

21. 1998 Das Graças C. Pereira, M., E.R. Atwill, M.R. Crawford, R.B. Lefebvre. DNA sequence similarity between California isolates of Cryptosporidium parvum. Applied and Environmental Microbiology 64(4): 1584-1586.

22. 1998 Higginbotham, G., J. Robinson, E.R. Atwill, M.G.C. Pereira. Effect of direct-fed microbial product on calf performance and health. Professional Animal Scientist 14(2): 108-113.

23. 1998 Atwill, E.R., J.A. Harp, T. Jones, P.W. Jardon, S. Checal, M. Zylstra. Evaluation of periparturient dairy cows and contact surfaces as a reservoir of Cryptosporidium parvum for calfhood infection. American Journal of Veterinary Research 59(9): 1116-1121.

24. 1998 Maldonado-Camargo, S., E.R. Atwill, J.A. Saltijeral-Oaxaca, L.C. Herrera-Alonso. Prevalence of and risk factors for shedding of Cryptosporidium parvum in Holstein Freisian dairy calves in central México. Preventive Veterinary Medicine 36(2): 95-107.

25. 1998 Kirk, J.H., E.R. Atwill, D. Festa, C. Adams. Effect of a commercial non-specific immuno-modulating biologic on newborn calf health. Journal of the American Veterinary Medical Association 213(9): 1308-1311.

 26. 1998 Nader, G., K.W. Tate, E.R. Atwill, J. Bushnell. Water quality effects of rangeland beef cattle excrement. Rangelands 20(5): 19-25.

27. 1998 Atwill, E.R., E. Johnson, D.J. Klingborg, G.M. Veserat, G. Markegard, W.A. Jensen, D.W. Pratt, R.E. Delmas, H.A. George, L.C. Forero, R.L. Phillips, S.J. Barry, N.K. McDougald, R.R. Gildersleeve, W.E. Frost. Age, geographic, and temporal distribution of fecal shedding of Cryptosporidium parvum oocysts in cow-calf herds. American Journal of Veterinary Research 60(4): 420-425.

28. 1998 Kirk, J.H., P. Susitaival, D. Wilson, E.R. Atwill, S. McCurdy, M. Schenker. Survey of occupational hazards in California veterinarians. California Veterinarian 52(6): 12-13.

29. 1999 Das Graças C. Pereira, M., E.R. Atwill, T. Jones. Comparison of  sensitivity of immuno-fluorescent microscopy to that of a combination of immunomagnetic separation and immuno-fluorescent microscopy for detection of Cryptosporidium parvum oocysts in adult bovine feces. Applied and Environmental Microbiology 65(7): 3236-3239.

30. 1999 Barwick, R.S., H.O. Mohammed, E.R. Atwill, P.L. McDonough, M.E. White. The prevalence of equine leptospirosis in New York State. Journal of Equine Science In press.

31. 1999 Hoar, B.R., E.R. Atwill, C. Elmi, W.W. Utterbach, A. Edmondson. Assessing the validity of rectal versus ground sampling as a method to estimate environmental contamination attributable to beef cattle shedding Campylobacter, Cryptosporidium, and Giardia. American Journal of Veterinary Research. In press.

32. 1999 Tate, K.W. E.R. Atwill, M.R. George, N.K. McDougald, and R.E. Larsen. Cryptosporidium parvum mobilization and transport from livestock fecal deposits on California rangeland watersheds. Journal of Range Management. In press.

33. 1999 Tate, K.W., E.R. Atwill, N.K. McDougald, M.R. George, and D. Witt. A comparative methodology for estimating livestock fecal loading on rangeland watersheds. Journal of Range Management. In press.

34. 1999 Atwill, E.R., N.K. McDougald, and L. Perea. Cross-sectional study of fecal shedding of Giardia sp. and Cryptosporidium parvum among packstock in the Sierra Nevada Range, California, U.S.A. Equine Veterinary Journal. In press.

35. 1999 Singer, R.S., W.O. Johnson, J.S. Jeffrey, R.P. Chin, T.E. Carpenter, E.R. Atwill, D.C. Hirsh. A statistical model for assessing bacterial colony selection strategies: a case study of Escherichia coli and avian cellulitis. Journal of Veterinary Diagnostic Investigations. In press.

36. 1999 Singer, R.S., J.S. Jeffrey, T.E. Carpenter, C.L. Cooke, R.P. Chin, E.R. Atwill, D.C. Hirsh. Spatial heterogeneity of Escherichia coli isolated from avian cellulitis lesions in broilers. Avian Diseases. In press.

37. 1999 Atwill, E.R., E. Johnson, M. Das Graças C. Pereira. Herd composition, stocking rate, and calving duration associated with fecal shedding of Cryptosporidium parvum oocysts in beef cattle herds. Journal of the American Veterinary Medical Association. In press.

Referenced Monograph

  1. 1997 Atwill, E.R. Pathogens excreted by livestock and transmitted to humans through water. University of California Agricultural Issues Center and Animal Agricultural Research Center, UC Davis. pp 1-18.

Compendiums of data; reports, regular distribution items; proceedings, chapters (non-refereed); extension teaching materials; video or audio tapes; popular articles; bulletins, leaflets; all publications distributed electronically.

1. l99l Atwill, E.R. Potomac horse fever in New York State. Eighth Annual Equine Practitioner’s Conference, Ithaca, New York

2. l99l Atwill, E.R., L.L. Rodriguez, D.W. Hird, and O. Rojas.  Logistic regression model for mapping the ecological distribution of vesicular stomatitis seropositivity in Costa Rican cattle.  Proceedings of the Sixth International Symposium of Veterinary Epidemiology and Economics.  Ottawa, Canada.  pp. 224-226.

3.  l993 Atwill, E.R., H.O. Mohammed, J.W. Lopez and E.J. Dubovi. Epidemiologic studies on equine onocytic ehrlichiosis. Centennial Poster Session. School of Veterinary Medicine, Cornell University.

4. l994 Atwill, E.R., H.O. Mohammed, J.M. Scarlett, and C.E. McCulloch. Interpretation of the random effects parameter and odds ratios in mixed effects logistic regression:  Intra-class correlation, bias and unreliability.  Proceedings of the Seventh International Symposium of Veterinary Epidemiology and Economics.  Nairobi, Kenya.  The Kenya Veterinarian 18(2): l56-l58.

5. l994 Atwill, E.R., H.O. Mohammed, J.W. Lopez, and E.J. Dubovi.  Risk factors for seropositivity to equine monocytic ehrlichiosis:  Evidence for the route of transmission.  Proceedings of the Seventh International Symposium of Veterinary Epidemiology and Economics.  Nairobi, Kenya.  The Kenya Veterinarian 18(2): 270-272.

6. 1994 de la Rua-Domenech, R., H.O. Mohammed, E.R. Atwill, T.J. Divers, J.F. Cummings, and A. de Lahunta.  Use of cluster analysis in assessment of geographical variations of Equine Motor Neuron Disease frequency.  Proceedings of the Seventh International Symposium of Veterinary Epidemiology and Economics.  Nairobi, Kenya.  The Kenya Veterinarian 18(2): 486.

7. l994 Barwick, R.S., E. R. Atwill, and H.O. Mohammed.  The impact of subjective test results on risk estimation in cross-sectional studies.  Proceedings of the Seventh International Symposium on Veterinary Epidemiology and Economics.  Nairobi, Kenya.  The Kenya Veterinarian 18(2): 568-570.

8. 1994 Atwill, E.R., H.O. Mohammed, J.W. Lopez, and E.J. Dubovi. Risk factors for seropositivity to equine monocytic ehrlichiosis:  Evidence for the route of transmission. Seventh International Conference on Equine Infectious Diseases. Tochigi, Japan. pp. 160.

9. 1995 Atwill, E.R. Assessing the risk of surface water contamination of Cryptospordium parvum from beef cattle production: implications for land use restrictions. Annual Beef and Range Field Day, “Managing hardwood rangelands to maintain and enhance water quality,” Sierra Foothill Research and Extension Center, UC Cooperative Extension. Browns Valley, California. April 20, pp. 15-17.

10. 1995 Atwill, E.R. Invited speaker. Water quality assessment (How to track down the water bugs - Cryptosporidium). Workshop on Application of State-Of-The-Art Biotechnology Techniques and Instrumentation for Forensic, Food Safety and Quality Applications, UC Biotechnology Program, UC Davis. June 13-14, pp. 18.

11. 1996 Atwill, E.R. Practitioner’s Update on Cryptosporidium in Horses, Beef and Dairy Cattle. 9th Annual Fall Symposium On Advances In Clinical Veterinary Medicine. School of Veterinary Medicine, University of California. Davis, California. November 9, pp.152-155.

12. 1997 Atwill, E.R. Agricultural Operations Report. Update on Cryptosporidium in Horses, Beef and Dairy Cattle. San Joaquin Experimental Range, California State University, Fresno. April 5, pp. 29-34.

13. 1997 Atwill, E.R. Cryptosporidiosis and diarrhea in calves. Proceedings of the International Workshop on Cryptosporidiosis: a Public and Animal Health Problem. Universidad Autónoma Metropolitana-Xochimilco, Mexico City. April 23-25.

14. 1997 Atwill, E.R. Epidemiology of cryptosporidiosis in animals. International Workshop on Cryptosporidiosis: a Public and Animal Health Problem. Universidad Autónoma Metropolitana-Xochimilco, Mexico City. April 23-25.

15. 1997 Atwill, E.R. Diagnostic methods for detecting Cryptosporidium parvum.  International Workshop on Cryptosporidiosis: a Public and Animal Health Problem. Universidad Autónoma Metropolitana-Xochimilco, Mexico City. April 23-25.

16. 1997 Maldonado Camargo, S., E.R. Atwill, J.A. Saltijeral Oaxaca. Prevalencia de Cryptosporidium parvum en becerras lactantes en el altiplano de México. International Workshop on Cryptosporidiosis: a Public and Animal Health Problem. Universidad Autónoma Metropolitana-Xochimilco, Mexico City. April 23-25.

17. 1997 HACCP-based program to control Cryptosporidium and other waterborne pathogens in the Alameda Watershed. San Francisco Public Utilities Commission. April 30, pp. 1-71. (coauthor)

18. 1997 Gallino, J., R.E. Bray, S.J. Wickler, E.A. Cogger, Atwill, E.R., T.P. Anderson, C. London. Endoparasite infections in feral horses. 15th Equine Nutrition and Physiology Society. Fort Worth/Dallas. May 28-31, pp. 344-347.

19. 1997 Nader, G., K.W. Tate, E.R. Atwill, D. Drake. Chapter on Water Quality Monitoring. “HOW TO” Monitor Rangeland Resources Manual. Intermountain Working Group, University of California Cooperative Extension. August 28, pp. 84-103.

20. 1997 Atwill, E.R. Cryptosporidium parvum in dairy wastewater and its implications for water quality. Workshop: dairy wastewater and public health concerns. Escondido, California. December 10, pp.1-14.

21. 1997 Atwill, E.R. Cryptosporidium parvum in dairy wastewater and its implications for water quality. Workshop: dairy wastewater and public health concerns. Ontario, California. December 11, pp.1-14.

22. 1997 Drake, D.J., E.R. Atwill, J.M. Connor, D. Jones. Prevalence of Cryptosporidium parvum, Giardia duodenalis, and Campylobacter jejuni in beef calves and impacts on pre-weaning gain and weaning weight. Western Section, American Society of Animal Science. San Luis Obispo, California.

23. 1998 Atwill, E.R. Rangeland cattle and the risk of waterborne Cryptosporidium parvum infection in humans. Cattlemen’s update: research on the  road. School of Veterinary Medicine, University of Nevada and Cooperative Extension. Ely, Nevada. January 12, pp. 11-17.

24. 1998 Atwill, E.R. Rangeland cattle and the risk of waterborne Cryptosporidium parvum infection in humans. Cattlemen’s update: research on the  road. School of Veterinary Medicine, University of Nevada and Cooperative Extension. Elko, Nevada. January 13, pp. 11-17.

25. 1998 Jones, T., E.R. Atwill. Statistical methods for quantifying and comparing loading of Cryptosporidium on watersheds from different livestock sources using epidemiologic survey data. International Conference on Source Water Protection, National Water Research Institute in cooperation with U.S. EPA and U.S. Geological Survey. Dallas, Texas. April 28-30, pp. 201-207.

26. 1998 Tate, K.W., B. Allen-Diaz, J. Harper, R. Dahlgren, E.R. Atwill. Hydrology, ecology, management and water quality on grazed hardwood rangeland watersheds.  Annual Spring Conference of California-Oregon-Idaho-Nevada Cooperative Extension Specialists and Farm Advisors. Nevada City, California. May 12-13.

27. 1998 Nader, G., K.W. Tate, M. Connor, B. Allen-Diaz, E.R. Atwill. Evaluation of buffer zones to attenuate nutrient and sediment transport from hillslope pastures. Annual Spring Conference of California-Oregon-Idaho-Nevada Cooperative Extension Specialists and Farm Advisors. Nevada City, California. May 12-13.

28. 1998 Barry, S., E.R. Atwill, K. Tate, T. Koopman J. Cullor, T. Huff. Developing and implementing a HACCP-based program to control Cryptosporidium and other waterborne pathogens in the Alameda Creek watershed. American Water Works Association Annual Conference. Dallas, Texas. June 21-25.

29. 1998  Kirk, J., P. Susitaival, D. Wilson, E.R. Atwill, S. McCurdy, M. Schenker. Survey of occupational hazards in California veterinarians. 135th American Veterinary Medical Association Annual Convention. Baltimore, Maryland. July 25-29, pp. 312-314.

30. 1998 Harter, T., S. Wagner, E.R. Atwill. IEHS Groundwater protection: the fate of Cryptosporidium parvum in porous media. 1998 International Conference and Special Workshop on Groundwater Quality: Remediation and Protection. Tubingen, Germany. September 20-24, pp. 1-6.

31. 1998 Atwill, E.R. Rangeland cattle and the risk of waterborne Cryptosporidium parvum infection in humans. 31st Annual Convention of the American Association of Bovine Practitioners. Spokane, Washington. September 24-26, pp. 62-66.

32.  1998 Fio, L. and E.R Atwill. Cryptosporidium in the water: are horses to blame? The Horse Report, Center for Equine Health, School of Veterinary Medicine, University of California, Davis. Vol 16(4) October, pp 1-6,

33. 1998 Hoar, B.R., E.R. Atwill, C. Elmi. Comparison of two sampling methods for estimating environmental risk attributable to beef cattle shedding pathogens of zoonotic concern. Source Water Protection Symposium: Focus on Waterborne Pathogens. San Francisco, California. October 28-31.

34. 1999 Atwill, E.R. Is livestock manure a risk to public health? Risk Factors to Profit and Growth. BANFF Pork Seminar, Banff, Alberta, Canada. January 12-15. Advances in Pork Production, Vol 10, pp 75-80.

35. 1999 Fio, L. and E.R Atwill. Cryptosporidium in the water: are horses to blame? The New Horsemen, California State Horsemen’s Association, Vol 13(4) January, pp 1-2.

36. 1999 Atwill, E.R. Rangeland cattle and the risk of waterborne Cryptosporidium parvum infection in humans. Food and Water Safety Symposium, American Association of Bovine Practitioners & Midwest American Society of Animal Science and American Dairy Science Association. Des Moines, Iowa. March 15, pp. 25-29.

37. 1999 Tate, K.W. and E.R Atwill. Transport of Cryptosporidium parvum on annual rangeland watersheds. Beef and Range Field Day, Sierra Foothill Research and Extension Center, University of California. Brown Valley, California. April 22, pp. 11-16.

38. 1999 Atwill, E.R. Rangeland cattle and the risk of waterborne Cryptosporidium parvum infection in humans. Beef and Range Field Day, Sierra Foothill Research and Extension Center, University of California. Brown Valley, California. April 22, pp. 5-10.

39. 1999 Barry, S., K. Tate, E.R. Atwill, T. Koopman, J. Cullor, T. Huff. Rangeland cattle and the risk of waterborne Cryptosporidium parvum infection in humans. Beef and Range Field Day, Sierra Foothill Research and Extension Center, University of California. Brown Valley, California. April 22, pp. 17-20.

40. 1999 Nader, G., K.W. Tate, M. Connor, B. Allen-Diaz, E.R. Atwill, D.J. Lewis. Evaluation of buffer zones to attenuate nutrient and nutrients and sediment transport from irrigated pastures. Beef and Range Field Day, Sierra Foothill Research and Extension Center, University of California. Brown Valley, California. April 22, pp. 39.

Items with limited distribution; progress or annual reports to funding agencies or commissions; comments for commodity group newsletters.

1. 1995 Atwill, E.R. Cryptosporidium parvum and cattle: implications for public health and land use restrictions. Newsletter to UCCE Livestock & Natural Resource Advisors; Range and Animal Science Specialists; California Cattlemen's Association Officers; Ag Issues Center, UC Davis; BLM-SWS Interagency Library, Sacramento. January 18, pp. 1-4.

2. 1995 Atwill, E.R. Invited contributor. Cryptosporidium parvum and cattle: implications for public health and land use restrictions. Literature review accompanying a video tape by Ron Fayer et al., Zoonotic Diseases Laboratory, ARS, USDA, distributed nationally by the Working Group on Water Quality, USDA, whereby 52 copies sent to National Cattlemen's Association, 52 copies to the Extension Service, 52 copies to the Consolidated Farm Service Agency, 800 copies distributed to members of the American Water Works Association, with additional copies sent to selected stakeholders. June 15, pp. 1-4. (revision of #1 requested by the USDA)

3. 1995 Atwill, E.R., D. Klingborg, J. Glenn. Medical ecology and molecular epidemiology of Cryptosporidium spp in California. Final project report, Division of Agriculture and Natural Resources, University of California. August 31, pp. 1-5

4. 1995 Atwill, E.R. Cow-calf operations and the prevalence of protozoal parasites in spring. Newsletter to UCCE Livestock & Natural Resource Advisors; Range and Animal Science Specialists; California Cattlemen's Association Officers; Ag Issues Center, UC Davis; District Veterinarians, Animal Health Branch, California Department of Food & Agriculture; BLM-SWS Interagency Library, Sacramento. September 8, pp. 1.

5. 1996 Atwill, E.R. Invited contributor. Cryptosporidium parvum and cattle: implications for public health and land use restrictions. Web page for the Water Quality Information Center, National Agricultural Library, Washington, DC. March 12, pp. 1-5. (revision of #1 requested by the USDA)

6. 1996 Tate, K.W., M. George, E.R. Atwill. Evaluation of the potential for pathogen contamination of surface water and the attenuation effectiveness of grass buffer strips in grazed watersheds. Final project report, Division of Agriculture and Natural Resources, University of California. August 26, pp. 1-11.

7. 1996 Atwill, E.R.   Preliminary findings on prevalence and associated risk factors for shedding critical water- and food-borne pathogens in California rangeland beef cow-calf herds.  LDRL Progress Report, Volume 2.

8. 1996 Atwill, E.R. and C. Holmberg. Sierra Foothill Research and Extension Center, University of California. Progress report: Preliminary findings on prevalence and associated risk factors for shedding critical water- and food-borne pathogens in California rangeland beef cow-calf herds. pp. 102-105.

9. l997 Atwill, E.R. LDRL Progress Reports. A: Preliminary findings on prevalence and associated risk factors for shedding critical water- and food-borne pathogens in California rangeland beef cow-calf herds. B: Assessing the environmental survivability of bovine-derived Cryptosporidium parvum oocysts and Giardia duodenalis cysts on cow-calf rangelands. February 5, pp. 1-3.

10. 1997 Atwill, E.R., T. Jones, and S. Vázquez-Flores. Technical report. Assessing the environmental risk from rangeland cattle shedding Cryptosporidium parvum oocysts in bovine feces: optimization of in vitro excystation rates. American Veterinary Medical Foundation. April 18, pp. 1-6.

11. 1997 Atwill, E.R. Cryptosporidiosis and diarrhea in calves. Newsletter to UCCE Livestock & Natural Resource Advisors; Range and Animal Science Specialists; California Cattlemen's Association Officers; Ag Issues Center, UC Davis; District Veterinarians, Animal Health Branch, California Department of Food & Agriculture; BLM-SWS Interagency Library, Sacramento. July, pp. 1-4.

12. 1997 Atwill, E.R., W. Boyce, K.W. Tate. Identification of the Reservoir and Route of Infection of Cryptosporidium parvum for Rangeland Cattle: Ramifications for Human Health and Water Quality. Final project report, Division of Agriculture and Natural Resources, University of California. August 29, pp. 1-5.

13. 1997 Allen-Diaz, B., K.W. Tate, E.R. Atwill. Fate and transport of non-point source pollution on grazed rangeland watersheds. Final project report, Division of Agriculture and Natural Resources, University of California. August 29, pp. 1-10.

14. 1998 Atwill, E.R., T. Jones, K. Tate. Assessing the environmental risk from rangeland cattle shedding Cryptosporidium parvum in their feces. Final project report, Sustainable Agriculture Research and Education Program, University of California. March 20, pp. 1-13.

15. 1998 Nader, G., K.W. Tate, E.R. Atwill, D. Drake. Water quality effects of rangeland beef cattle excrement. Range Science Report #35, Department of Agronomy and Range Science, UC Davis and UC Cooperative Extension. April, pp. 1-11.

16. 1998 Atwill, E.R. and K.W. Tate. Initial inventory of non-point source contaminants of primary concern on Stafford Lake watershed. North Marin Water District. July 9, pp. 1-10.

17. 1998 Atwill, E.R. and T.L. Rose. Corbicula fluminea as an environmental assay for detection of Cryptosporidium parvum in surface waters. Technical Completion Report, Water Resources Center, University of California. August, pp. 1-46.

18. 1998 Tate, K.W., G. Nader, B. Allen-Diaz, E.R. Atwill. The effectiveness of thirty foot vegetative buffer zones to filter nutrients and pathogens from irrigated pasture tail water. Annual Report. Sierra Foothill Research and Extension Center, University of California.

19. 1999 Harter, T., E.R. Atwill, W.R. Horwath, R.D. Meyer, M. Campbell-Mathews. Impact of waste management on chronic exposure of dairy cattle to well water nitrate. California Dairy Research Foundation Semi-Annual Report. February 2, pp. 1-11.

20. 1999 Tate, K.W. and E.R. Atwill. Rainfall depth, duration, and return frequency information for typical California annual rangelands. Range Science Report #36, Department of Agronomy and Range Science, UC Davis and UC Cooperative Extension. April, pp. 1-5.

21. 1999 Rulofson, F. and E.R. Atwill. Assessing the risk of using treated waste water for irrigation as a source of Cryptosporidium parvum and Giardia duodenalis for beef cattle. Tuolumne Utility District. June 23, pp. 1-4.

22. 1999 E.R. Atwill, E. Johnson, D.J. Klingborg, M. Das Graças C. Pereira, S.J. Wickler. The ecology and epidemiology of Cryptosporidium parvum and Giardia duodenalis in California horses: ramifications for watershed quality and access to public lands. Center for Equine Health. June 25, pp. 1-2.

Published abstracts; book reviews and editorials.

1. 1995 Barwick, R.S., H.O. Mohammed, P.L. McDonough, E.R. Atwill. The epidemiology of equine leptospirosis in New York state. XXV Congress of the World Veterinary Association. Yokohama, Japan. FC7.4.2

2. 1997 Atwill, E.R. Medical ecology of Cryptosporidium parvum in beef cattle and its ramifications for source water quality. International Symposium on Waterborne Cryptosporidium. Newport Beach, California.

3. 1997 Atwill, E.R., J.A. Harp, T. Jones, P.W. Jardon, S. Checal, M. Zylstra. Evaluation of periparturient dairy cows and contact surfaces as a reservoir of Cryptosporidium parvum for calfhood infection. 92nd Annual Meeting of the American Dairy Science Association. University of Guelph, Canada. Journal of Dairy Science 80(Suppl. 1): 469.

4. 1997 Maldonado Camargo, S., F.R. Gay Jiménez, E.R. Atwill, J.A. Saltijeral Oaxaca, L.C. Herrera Alonso. Prevalencia de Cryptosporidium parvum en becerras lactantes en el altiplano. 28th Congreso Nacional de Microbiología. Culiacán, México.  pp. 87.

5. 1997 Saltijeral Oaxaca, J.A. and E.R. Atwill. Frequency of Cryptosporidium parvum in calves in Mexico. 9th International Congress in Animal Hygiene. Helsinki, Finland.

6. 1997 Rulofson, F.C. and E.R. Atwill. Prevalence of shedding of Cryptosporidium parvum and Giardia sp. in llamas used for backcountry recreation. 82nd Annual Meeting of the National Association of County Agricultural Agents. Burlington, Vermont. pp. 15.

7.  1997 Atwill, E.R. Livestock production, waterborne zoonotic disease, and the search for the smoking gun. Riparian and Watershed Management in the Interior Northwest: an Interdisciplinary Perspective. Society for Range Management, the Wildlife Society, American Fisheries Society, Society of American Foresters, and the Blue Mountains Natural Resources Institute. La Grande, Oregon, pp 49.

8. 1997 Drake, D.J., E.R. Atwill, J.M. Connor, D. Jones. Prevalence of Cryptosporidium parvum, Giardia duodenalis, and Campylobacter jejuni in beef calves and impacts on pre-weaning gain and weaning weight. Journal of Animal Science 75(Suppl. 1):107.

9. 1997 Harter, T., S. Wagner, E.R. Atwill. Transport of Cryptosporidium parvum through saturated sand columns. Fall Meeting, American Geophysical Union. San Francisco, California.

10. 1998 Rulofson, R.C. and E.R. Atwill. Assessing the risk of surface water contamination of Giardia sp. and Cryptosporidium parvum from recreational use of llamas. Rangelands of the Americas: sharing resources, sharing responsibility. 51st Annual Meeting of the Society for Range Management. Guadalajara, Mexico, pp. 51-52.

11. 1998  Atwill, E.R., K.W. Tate, M.R. George, and N.K. McDougald. Transport of Cryptosporidium parvum oocysts out of fecal patties as a function of slope during simulated rainfall. Rangelands of the Americas: sharing resources, sharing responsibility. 51st Annual Meeting of the Society for Range Management. Guadalajara, Mexico, pp. 51.

12. 1998 Tate, K.W., E.R. Atwill, M.R. George, and N.K. McDougald. Pathogen mobilization from fecal pats during natural rainfall on California annual rangeland. Rangelands of the Americas: sharing resources, sharing responsibility. 51st Annual Meeting of the Society for Range Management. Guadalajara, Mexico, pp. 54-55.

13. 1998 Tate, K.W., N.K. McDougald, E.R. Atwill, M.R. George, D. Witt. A comparative yield method to estimate livestock manure deposition on California rangeland watersheds. Rangelands of the Americas: sharing resources, sharing responsibility. 51st Annual Meeting of the Society for Range Management. Guadalajara, Mexico, pp 54.

14.  1998 Tate, K.W., M.R. George, E.R. Atwill, and S. Barry. California rangelands:
balancing livestock production and water quality. Proceedings of the California Plant and Soil Conference: Agricultural Challenges in an Urbanizing State. Sacramento, California.

15. 1998 Barry, S., K. Tate, E.R. Atwill, J. Cullor, T. Koopman, T. Huff. Development and use of a HACCP (Hazard analysis and critical control points) program to protect water quality in a rangeland watershed. J. Soil and Water Conservation 53(2):173.

16. 1998  Atwill, E.R., K.W. Tate, M.R. George, and N.K. McDougald. Transport of Cryptosporidium parvum oocysts out of fecal patties during simulated rainfall. Symposium on Rangeland Management and Water Resources, American Water Resources Association. Reno, Nevada, pp. 446.

17. 1998 Tate, K.W., E.R. Atwill, M.R. George, and N.K. McDougald. Cryptosporidium parvum mobilization from fecal pats during natural rainfall on California annual rangeland. Symposium on Rangeland Management and Water Resources, American Water Resources Association. Reno, Nevada, pp. 445.

18. 1998 Witt, D., K.W Tate, E.R. Atwill, N.K. McDougald, M.R. George. A rapid method for estimating livestock manure deposition on rangeland watersheds. Symposium on Rangeland Management and Water Resources, American Water Resources Association. Reno, Nevada, pp. 135.

19. 1998 Nader, G.A., K.W. Tate, M.J. Connor, B. Allen-Diaz, E.R. Atwill. Evaluation of buffer zones to attenuate nutrient and sediment transport from hill-slope pastures. Symposium on Rangeland Management and Water Resources, American Water Resources Association. Reno, Nevada, pp. 133.

20. 1998 Barry, S., K. Tate, E.R. Atwill, J. Cullor, T. Koopman, T. Huff. Development and use of a HACCP (Hazard analysis and critical control points) program to protect water quality in a rangeland watershed. Symposium on Rangeland Management and Water Resources, American Water Resources Association. Reno, Nevada, pp. 443.

21. 1998 Nader, G.A., K.W. Tate, E.R. Atwill, D. J. Drake. Water quality impacts of rangeland beef cattle excrement. Symposium on Rangeland Management and Water Resources, American Water Resources Association. Reno, Nevada, pp. 444.

22. 1998 Rulofson, F.C. and E.R. Atwill. Assessing the risk of using treated wastewater for irrigation as a source of Cryptosporidium parvum and Giardia sp. for beef calves. 83rd Annual Meeting of the National Association of County Agricultural Agents. San Antonio, Texas, pp 13.

23. 1998 Kirk, J., J. Jeffrey, C. Holmberg, E.R. Atwill. Prevalence of Salmonella isolated from wild birds on two California diaries. Salmonella Committee, United States Animal Health Association. Minneapolis, Minnesota.

24. 1998 George, J., W.M. Sischo, E.R. Atwill, L. Lanyon The epidemiology of Cryptosporidia on dairy farms and in streams. Conference of Research Workers in Animal Diseases. Chicago, Illinois.

25. 1999 Singer, R.S., J.S. Jeffrey, E. R. Atwill, C.L. Cooke, T.E. Carpenter, D.C. Hirsh. Assessing sampling bias in molecular epidemiological studies using isolates of Escherichia coli from avian cellulitis lesions as an example. Western Poultry Disease Conference. Vancouver, British Columbia, Canada.

26. 1999 Phillips, R.L. and E. R. Atwill. Cryptosporidium and Giardia in livestock and some species of wildlife. San Joaquin Valley Natural Communities Conference. Bakersfield, California.

27. 1999 Jeffrey, J.S., E.R. Atwill, A. Hunter. Cross-sectional study on food safety pathogens in commercial squab production. 136th American Veterinary Medical Association Annual Convention. New Orleans, Louisiana.

28. 1999 Atwill, E.R., K.W. Tate, M. Das Graças C. Pereira, S. Camargo Maldonado, N. McDougald Statistical methods for estimating loading rates at the watershed scale for microbial pathogens (Cryptosporidium parvum) from animal agricultural sources. 7th Annual Non-point Source Monitoring Workshop, Non-Point Source Pollution Control Program, U.S. Environmental Protection Agency, Morro Bay, California.

29. 1999 Tate, K.W., R. Dahlgren, M.J. Singer, B. Allen-Diaz, E.R. Atwill. Temporal variability in water quality on California rangeland watersheds: implications for BMP effectiveness monitoring and TMDL developement. 7th Annual Non-Point Source Monitoring Workshop, Nonpoint Source Pollution Control Program, U.S. Environmental Protection Agency, Morro Bay, California.

30. 1999 Tate, K.W. G. Nader, D.J. Lewis, M. Connor, E.R. Atwill. Evaluation of buffer zones to attenuate suspended sediment, NO3-N, and total phosphorus in runoff from grazed hillslope pastures. 7th Annual Non-point Source Monitoring Workshop, Non-Point Source Pollution Control Program, U.S. Environmental Protection Agency, Morro Bay, California.

31. 1999 Harter, T., S. Wagner, E.R. Atwill. Colloid transport properties of Cryptosporidium parvum in sandy porous media. International Symposium on Subsurface Microbiology. Colorado.

32. 2000 Tate, K.W., R. Dahlgren, M.J. Singer, B. Allen-Diaz, E.R. Atwill. Temporal water quality variability on California rangeland watersheds: implicatins for monitoring. 53rd Annual Meeting of the Society for Range Management. Boise, Idaho.

Submitted

1. 1998 Jones, Ted and E.R. Atwill. Deriving bounds for public health risk due to environmental contaminants by maximizing functionals of probability measures. Manuscript.

2. 1998 Rochelle, P.A., E.M. Jutras, E.R. Atwill, R. DeLeon, M.H. Stewart. Polymorphisms in the Beta-tubulin gene of Cryptosporidium parvum differentiate between isolates based on animal host but not geographic origin. Journal of Parasitology. Manuscript.

3. 1998 Sischo, W.M. E.R. Atwill,  J. George, L.E. Lanyon. Cryptosporidia on dairy farms and the role these farms may have in contaminating surface water supplies in the northeastern United States. Preventive Veterinary Medicine. Manuscript.

4. 1999 Harter, T., S. Wagner, E.R. Atwill. Colloid transport and filtration of Cryptosporidium parvum in sandy soils and aquifer sediments. Environmental Science and Technology. Manuscript.

5. 1999 Drake, D.J., E.R. Atwill, R. Phillips, E. Johnson. Prevalence of internal parasites in California’s beef cattle. California Agriculture. Manuscript.

6. 1999 Tate, K.W. R.A. Dahlgren, M.J. Singer, B. Allen-Diaz, E.R. Atwill. Monitoring water quality on California rangeland watersheds; timing is everything. California Agriculture. Manuscript.