Emerging Zoonotic Diseases Summit

August 23, 2005 l Hilton UF Hotel and Conference Center l Gainesville, FL

l-Dr. Greg Christy l-Dr. John R. Dunn l-Dr. Stacy Holzbauer l-Ryan A. Maddox, MPH      
l-Dr. Kerry Clark

l-Dr. Paul Gibbs

l-Dr. David Johnson l-Dr. Jennifer McQuiston
l-Dr. Joseph A. DiPietro l-Dr. Thomas J. Holt l-Dr. Lonnie J. King  

Dr. Greg Christy

Greg Christy, DVM, graduated from the Missouri Southern State University in Joplin MO in 1980 with a B.S in Biology. He graduated from University of Missouri, College of Veterinary Medicine in Columbia, MO with a Doctor of Veterinary Medicine in 1984.  

Upon graduation, Christy was Owner/Operator of two veterinary hospitals in Carthage, MO from 1986 to 2000, and Owner/ Operator of VSSI, a veterinary equipment manufacturer and distributor in Carthage, MO from 1988 to 2000. 

He also served as Adjunct Professor at Missouri Southern State University in Joplin, MO from 1986-2001, and was the Army Reserve Veterinary Corps Officer, Honorably Discharged in 2005. 

From 2001 to present, Christy serves as Veterinarian Manager for the Florida Department of Agriculture and Consumer Services, Division of Animal Industry. He is also the Division’ Emergency Programs Administrator, State Emergency Operations Center, State Coordinator for Animal and Agricultural issues, (ESF 17) and Director of the State Agricultural Response Team (SART).  

Dr. Kerry Clark

Dr. Clark was born and raised in Louisville, KY, and later attended and graduated from Western Kentucky University with a B.S. degree in public health in 1992. He obtained his master’s degree in public health epidemiology from the University of Alabama at Birmingham School of Public Health in 1993. His deep love of nature and interest in human health were meshed by his growing interest in human diseases whose causative agents have animal reservoirs (zoonoses). This led him to pursue doctoral studies of vector-borne diseases. He earned his Ph.D. from the University of South Carolina School of Public Health, Department of Environmental Health Sciences, with an emphasis on arthropod vectors and vector-borne disease ecology. His dissertation research involved an ecological study of the Lyme disease spirochete, Borrelia burgdorferi, in South Carolina, the first such investigation in that state.

He took a tenure-earning faculty position in the Center for Community Health at the University of Southern Mississippi immediately after graduation in 1996. There, he taught courses in epidemiology and environmental health sciences, and continued his ongoing studies of Borrelia and other arthropod-borne pathogens in the southeastern United States. In 1999, he moved to his present faculty position in the Department of Public Health at the University of North Florida in Jacksonville, where he continues to teach courses in epidemiology and environmental health sciences to students in several undergraduate and graduate programs. He earned tenure and was promoted to associate professor in 2004.

Dr. Clark’s research career has focused on the ecology and epidemiology of human borreliosis, babesiosis, ehrlichiosis, rickettsiosis, and other tick-borne zoonoses in the southeastern U.S. He collaborated with investigators at Georgia Southern University’s Institute for Arthropodology and Parasitology in several studies, including those leading to the first isolations and characterizations of B. burgdorferi, in South Carolina. His previous findings implicated multiple Ixodes species ticks in the enzootic transmission and maintenance of Lyme borreliae in that state, and clarified the ticks’ seasonal activities and host associations. Most recently, Dr. Clark and colleagues discovered the presence of three Lyme Borrelia species infecting lizards in Florida and South Carolina, suggesting that they may serve as natural reservoirs in the Southeast.

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Dr. Joseph A. DiPietro

Dr. Joseph A. DiPietro is Dean of the University of Florida College of Veterinary Medicine. He has held this position since 1997. Formerly an administrator at the University of Illinois College Of Veterinary Medicine, he is known for his scientific contributions to the epidemiology, control and treatment of parasitic diseases of livestock, specifically horses, cattle and swine. He taught within the DVM and graduate programs at the University of Illinois, where he maintained a laboratory for research activities and graduate training programs. Prior to joining the University of Florida administration in January 1997, Dr. DiPietro was Associate Dean of Research at the University of Illinois College of Veterinary Medicine. He also held an appointment as Assistant Director of the Agriculture Experiment Station at University of Illinois College of Agriculture.

Dr. DiPietro has served on numerous committees and boards. Among these include as a member of the American Association of Equine Practitioners Biologic and Therapeutic Committee, secretary and member of the North Central USDA Advisory Committee-NC-02, member of the U.S. Pharmacopia Board on Veterinary Medicine, member of the American Association of Equine Practitioners Research Committee, member of the Florida Farm Bureau Equine Advisory Committee, Organizing Committee Member of the International Cyathostome Workshop, Illinois Racing Board Commissioner, member of the Board of Directors of the University of Florida Foundation, member of the University of Florida Foundation Finance Committee, Chair and member of the University of Florida Council on Affirmative Actions, Chair of the Board of Directors of the Veterinary Medicine Faculty Association, member of the National Agricultural Research, Education and Economics Advisory Board and member of the National Research Council, Board on Agriculture and Natural Resources Committee on the Future Role of Pesticides in U.S. Agriculture.

Dr. DiPietro is currently the president-elect for AAVMC, and he has previously served the AAVMC as chair and member of the Research Deans and Directors Committee, as Secretary and member of the Board of Directors, representative on the NASULGC Board on Veterinary Medicine, member of the Accreditation Task Force, member of the Comparative Data Committee, liaison to the Experiment Station Committee on Organization and Policy Budget, Legislative, Advocacy and Marketing Committee, Board on Agriculture, NASULGC, and member of the Veterinary Medical College Applications Service Oversight Committee.

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Dr. John R. Dunn

Dr. John Dunn, DVM, PhD, attended Louisiana State University where he obtained a BS in Zoology in 1991. After completing his Doctor of Veterinary Medicine degree, he spent three years in mixed animal veterinary practice in Zachary, Louisiana. Dr. Dunn completed a PhD in veterinary medical sciences at Louisiana State University in 2003. Dr. Dunn conducted collaborative research with USDA-ARS focused on the pre-harvest epidemiology of Shiga-toxigenic E. coli in ruminants. Dr. Dunn joined the Centers for Disease Control and Prevention in July 2003 where he worked in the Foodborne and Diarrheal Diseases Branch / FoodNet / NARMS group as an Epidemic Intelligence Service Officer. Dr. Dunn’s responsibilities included response to national and international requests involving foodborne and diarrheal illnesses, investigation of foodborne and diarrheal disease outbreaks, consultation regarding the recognition, management, and epidemiologic investigation of botulism, as well as designing and conducting applied epidemiologic research on foodborne diseases and antibiotic resistance. Dr. Dunn’s interests include infectious disease epidemiology, zoonoses, and pre-harvest food safety. Dr. Dunn currently holds a commission as a Lieutenant Commander in the United States Public Health Service and works as a CDC field assignee in the Tennessee Department of Health Communicable and Environmental Diseases Section.

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Dr. Paul Gibbs

Paul Gibbs graduated as a veterinarian from the University of Bristol in 1967 and subsequently focused his career on the epidemiology, control and prevention of emerging viral diseases. For nearly 10 years he worked at the Institute of Animal Health in the UK on diseases such as foot-and-mouth disease, bluetongue, sheep pox, and rinderpest. In 1979, he joined the newly established College of Veterinary Medicine at the University of Florida. In Florida, apart from teaching, he has worked on several emerging problems and foreign animal diseases that threaten the USA, most recently West Nile virus encephalitis in horses, canine influenza, and bovine spongiform encephalopathy. The focus of his work often takes him overseas to investigate emerging problems. He is a consultant to several international agencies and pharmaceutical companies.

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Dr. Thomas J. Holt


Dr. Thomas J. Holt, DVM, currently serves as the Florida State Veterinarian and Director, Division of Animal Industry, Department of Agriculture and Consumer Services. In this position, he oversees the Bureau of Animal Disease Control and the Bureau of Diagnostic Laboratories. He is responsible for enforcing animal health regulations in Florida and protecting the state from animal pests and diseases which have major economic and public health consequences.


Dr. Holt retired from the U.S. Department of Agriculture after serving a number of years as an Associate Director for Emergency Management for Veterinary Services. He is recognized for his experience and expertise in veterinary and zoonotic disease surveillance and control strategies and has worked throughout the United States and in several foreign countries with responsibility for overseeing animal health programs.

Selected Accomplishments:

·        Led Division of Animal Industry emergency response efforts in support of livestock and poultry industries and con the investigation and response to a serious E. coli outbreak in children associated with petting zoo animals at three fairs in 2005.

·        Served as Incident Commander in successful eradication of avian influenza in a major outbreak in concentrated poultry production area of Virginia and West Virginia involving more than 800 responders from 46 States.

·        Directed successful seizure, sample collection, and laboratory transport of TSE affected sheep in Vermont as part of a nationally declared Extraordinary Emergency.

·        Played a lead role in planning and directing early animal health response efforts to the first outbreak of West Nile Virus in the United States. This serious human and equine disease was first suspected as an exotic disease and characterized by the veterinary community.

·        Led national response to M. tuberculosis outbreak in elephants, utilizing team of public and private veterinary and medical specialists, to develop testing and treatment program in preventing disease transmission to animals and people.

·        Served as USDA Task Force Director in response to nationally declared Extraordinary Empanion animals in declared emergencies for four major Florida hurricanes in 2004.

·        Coordinated agricultural response efforts in assisting Florida Department of Health imergency to control a serious increase in egg–associated Salmonella outbreaks in people in the United States.


Dr. Holt earned B.S. and DVM degrees from Cornell University.


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Dr. Stacy Holzbauer

Dr. Holzbauer received a Bachelors of Science in Animal Science at South Dakota State University in 2000 and her Doctor of Veterinary Medicine at Iowa State University in 2002. She practiced as a large animal veterinarian in Cresco, Iowa before joining the Center for Food Security and Public Health in Ames, Iowa. Here, she developed education materials on agro- and bioterrorism agents and foreign animal diseases for veterinarians, health care providers, and the lay public while attending the University of Iowa College of Public Health. She received her MPH from the University of Iowa in July 2004. She then accepted a position as the Association of Teachers of Preventative Medicine Fellow in the Foodborne and Diarrheal Disease Branch at the Centers for Disease Control and Prevention. She has recently been named the Veterinary Medical Director of the Get Smart on the Farm program. Her main duties include coordinating educational activities to help promote appropriate use of antimicrobial agents in animals and fostering collaboration between state public health and veterinary communities. 

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Dr. David Johnson

Dr. David Johnson graduated from Wright State University School of Medicine in 1983. Subsequently, he completed a Family Practice internship; and then a residency in Occupational and Environmental Medicine while earning a Masters degree in Environmental Health at the University of Cincinnati.

Dr. Johnson is board certified in three areas including: Occupational Medicine; Public Health and Preventive Medicine; and Toxicology. He is a Fellow of the American College of Occupational and Environmental Medicine.

Dr. Johnson has been with the Florida Department of Health since 1999. He is currently the Executive Medical Director for the Division of Environmental Health, and the Acting State Epidemiologist for Florida.

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Dr. Lonnie J. King

Dr. Lonnie King was appointed dean of the College of Veterinary Medicine, Michigan State University, effective July 1, 1996, and became the college's 11th dean since it was established by the Michigan legislature in 1910. As dean, he is the chief executive officer for academic programs, research, the teaching hospital, diagnostic center for population and animal health, basic and clinical science departments, and the outreach and continuing education programs. As dean and professor of large animal clinical sciences, Dr. King has been instrumental in obtaining funds for the construction of a $60 million Diagnostic Center for Population and Animal Health, initiated the Center for Emerging Infectious Diseases in the college, serves as the campus leader in food safety and oversees the National Food Safety and Toxicology Center. He has brought the Center for Integrative Toxicology to the college and is a designated leader for counter-bioterrorism activities at the college and is involved in re-establishing public health programs at Michigan State University.

Prior to this, Dr. King was Administrator for the Animal and Plant Health Inspection Service (APHIS), U.S. Department of Agriculture, in Washington, DC. In this role, he provided executive leadership and direction for ensuring the health and care of animals and plants, to improve agricultural productivity and competitiveness, and to contribute to the national economy and public health. He had served as Administrator of APHIS since October 1992, and prior to that time was Associate Administrator. Dr. King served as the country’s chief veterinary officer for 5 years and worked extensively in global trade agreements within NAFTA and the World Trade Organization.

Before beginning his government career in 1977, Dr. King was in private veterinary practice for seven years in Dayton, Ohio, and Atlanta, Georgia. Prior to his current appointment, his assignments included field veterinary medical officer in Georgia and station epidemiologist in Texas. He spent five years in Hyattsville, Maryland, in staff assignments in Emergency Programs, as well as Animal Health Information. While in Hyattsville, Dr. King directed the development of the agency's National Animal Health Monitoring System. He left APHIS briefly to serve as the Director of the Governmental Relations Division of the American Veterinary Medical Association in Washington, DC and served as the lobbyist for the AVMA on Capitol Hill. From 1988 to 1991, Dr. King was the Deputy Administrator for Veterinary Services. In that position he was responsible for directing national veterinary and animal health programs, including the National Veterinary Services Lab and Plum Island Animal Disease Center.

As a native of Wooster, Ohio, Dr. King received his Bachelor of Science and Doctor of Veterinary Medicine degrees from The Ohio State University in 1966 and 1970, respectively. He earned his Master of Science degree in epidemiology from the University of Minnesota while on special assignment with the U.S. Department of Agriculture in 1980. He also received his master's degree in public administration from American University in Washington, DC in 1991. Dr. King has a broad knowledge of animal agriculture and the veterinary profession through his work with other governmental agencies, universities, major livestock and poultry groups, and private practitioners. Dr. King is a board-certified member of the American College of Veterinary Preventive Medicine, and has completed the Senior Executive Fellowship program at Harvard University. He has served as president of the Association of American Veterinary Medical Colleges from 1999-2000 and was the vice-chair for the National Commission on Veterinary Economic Issues from 2000-2004. Dr. King helped start the National Alliance for Food Safety, served on the Governor’s Task Force on Chronic Wasting Disease for the State of Michigan, and four National Academy of Sciences Committees; most recently he chairs the National Academies Committee on Assessing the Nation’s Framework for Addressing Animal Diseases. Dr. King is one of the developers of the Science, Politics and Animal Health Policy Fellowship Program and lectures extensively on the future of animal health and veterinary medicine. He serves as a consultant and member of the Board of Scientific Counselors to the CDC’s National Center for Infectious Diseases, is a member of the Institute of Medicine’s Committee on Microbial Threats to Health, editor for the OIE Scientific Review on “Emerging Zoonoses,” and is president of the American Veterinary Epidemiology Society. Dr. King was elected as a member of the Institute of Medicine of The National Academies in 2004. Beginning in February 2005, Dr. King is on loan from Michigan State University to the Centers for Disease Control and Prevention in Atlanta, serving as Director of the agency’s new Office of Strategy and Innovation until January 2006.

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Ryan A. Maddox, MPH         

Ryan Maddox, MPH, is a surveillance officer at the Centers for Disease Control and Prevention’s National Center for Infectious Diseases in the Division of Viral and Rickettsial Diseases. He is responsible for nationwide surveillance of Kawasaki syndrome and human prion diseases, including Creutzfeldt-Jakob disease and variant Creutzfeldt-Jakob disease (the human form of bovine spongiform encephalopathy, or “mad cow” disease). In 2003, Ryan assisted with CDC’s monkeypox outbreak response, providing epidemiologic support. He regularly speaks to various groups and graduate classes about prion diseases and surveillance issues.

Ryan is currently working on his doctor of philosophy degree in epidemiology at Emory University’s Rollins School of Public Health, where he also received his master of public health degree in epidemiology. His doctoral dissertation focuses on Kawasaki syndrome in the United States. Ryan first became interested in the relationship of animal and human diseases at Auburn University, where he graduated with a bachelor of science degree in zoology with a pre-med concentration.

Ryan resides in Atlanta with his wife, Kathy. They have a little dog.

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Dr. Jennifer McQuiston

Jennifer McQuiston received her D.V.M. from Virginia-Maryland Regional College of Veterinary Medicine in 1997, as well as a M.S. in molecular biology from the same school in 1998. In 1998, she entered CDC’s 2-year Epidemic Intelligence Service, where she was trained as a field epidemiologist focusing on zoonotic disease outbreaks involving viral and rickettsial diseases. Following completion of her EIS fellowship, CDR McQuiston has continued to work at CDC as a Veterinary Epidemiologist and as a commissioned officer in the U.S. Public Health Service.

Her areas of expertise include research and disease outbreak investigations involving rabies, Rocky Mountain spotted fever, ehrlichiosis, and Q fever. She has conducted numerous domestic and international outbreak investigations, and her experiences have included investigating outbreaks of Q fever in Bosnia Herzegovina in 2000, assisting with the response to Foot and Mouth Disease outbreaks in the U.K. in 2001, assisting in CDC’s response to terrorism by instituting syndromic surveillance in NYC following the Sept. 11th attacks, and most recently by coordinating CDC’s animal tracing and quarantine efforts during the 2003 monkeypox outbreak in the United States.

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