Patricia A Dunn, DVM, MAM, DACPV

Patricia A Dunn, DVM, MAM, DACPV

  • Clinical Professor
  • Avian Pathologist and Field Investigator
Animal Diagnostic Lab
Wiley Lane

University Park, PA 16802

Areas of Expertise

  • Emphasis on diagnosis and control of infectious diseases of poultry, waterfowl, gamebirds.
  • Board certification in the American College of Poultry Veterinarians.


  • MAM, College of Veterinary Medicine, University of Georgia, 1991
  • DVM, School of Veterinary Medicine, University of Wisconsin, 1989
  • BS, Biology - Pennsylvania State University, 1979

Current Diagnostic Activities

Head of Avian Pathology/Avian Medicine section of the Animal Diagnostic Laboratory: Coordinate and direct the avian diagnostic and field investigation services.

Elucidation of causation of economically important diseases/conditions of poultry, including Muscovy duck parvovirus, variant reoviral infections of meat-type chickens, turkeys and ducks, focal duodenal necrosis in layer chickens, verminous hepatitis in turkeys, cecal spirochetosis in laying hens, and copper-induced proventriculopathy in broiler chickens.

Specialty Board Certification

American College of Poultry Veterinarians, 1992

Teaching Experience

Principles of avian diseases, general pathology, pathobiology, avian biology.

Selected Publications

Poonia, B., Dunn, P. A., Lu, H., Jarosinski, K. W., and Schat, K. A. Isolation and molecular characterization of a new Muscovy duck parvovirus from Muscovy ducks in the USA. Avian Pathol. 2006 Dec;35(6):435-41. [PubMed Link] - opens new window

Lu, H., Dunn, P. A., Wallner-Pendleton, E. A., Henzler, D. J., Kradel, D. C., Liu, J., Shaw, D. P., and Miller, P. Investigation of H7N2 avian influenza outbreaks in two broiler breeder flocks in Pennsylvania, 2001-02. Avian Dis. 2004 Jan-Mar;48(1):26-33. [PubMed Link] - opens new window

Dunn, P. A., Wallner-Pendleton, E. A., Lu, H., Shaw, D. P., Kradel, D., Henzler, D. J., Miller, P., Key, D. W., Ruano, M., and Davison, S. Summary of the 2001-02 Pennsylvania H7N2 low pathogenicity avian influenza outbreak in meat type chickens. Avian Disease 2003;47(3 Suppl):812-6. [PubMed Link] - opens new window

Ziegler, A. F., Ladman, B. S., Dunn, P. A., Schneider, A., Davison, S., Miller, P. G., Lu, H., Weinstock, D., Salem, M., Eckroade, R. J., and Gelb. J., Jr. Nephropathogenic infectious bronchitis in Pennsylvania chickens 1997-2000. Avian Dis. 2002 Oct-Dec;46(4):847-58. [PubMed Link] - opens new window

Davis, J. F., McMurtry, J. P., Vasilatos-Younken, R., Connolly, B. M., Woolcock, P. R., Dunn, P. A. Experimental reproduction of a spiking mortality syndrome of turkeys. Avian Dis. 1997, Apr-Jun;41(2):269-78. [PubMed Link] - opens new window

Davis, J. F., de la Torre, J. C., Castro, A. E., Connolly, B. M., Doman, J. T., and Dunn PA. Experimental reproduction of hypoglycemia-spiking mortality syndrome in broiler chickens with the use of homogenized brains containing arenaviruslike particles. Avian Disease 1997 Apr-Jun;41(2):442-6. [PubMed Link] - opens new window

Maddox CW, Baker SE, Dunn PA, Castro AE. Immunoglobulin response to Salmonella enteritidis outer membrane proteins. Use for evaluating infectious status. Adv Exp Med Biol. 1997;412:89-92. [PubMed Link] - opens new window

Davis, J. F., Castro, A. E., de la Torre, J. C., Barnes, H. J., Doman, J. T., Metz, M., Lu, H., Yuen, S., Dunn, P. A., and Teng, M. N. Experimental reproduction of severe hypoglycemia and spiking mortality syndrome using field-derived and embryo-passaged preparations. Avian Dis. 1996 Jan-Mar;40(1):158-72. [PubMed Link] - opens new window

Owen, R. L., Wideman, R. F., Jr., Leach, R. M., Cowen, B. S., Dunn, P. A., and Ford, B.C. Physiologic and electrocardiographic changes occurring in broilers reared at simulated high altitude. Avian Diseases, 1995 Jan-Mar;39(1):108-15. [PubMed Link] - opens new window

Dibner, J. J., Kitchell, M. L., Robery, W. W., Yersin, A. G., Wideman, R. F., Jr., and Dunn, P. A. Liver damage in mature laying hens: Comparison of field samples with livers from layers fed high levels of 2-hydroxy-40(methylthio) butanoic acid (hmb, Alimet) or dl-methionine (dlm). J Poultry Res, 1995, In Press.

Owen, R. L., Wideman, R. F., Leach, R. M., Cowen, B. S., Dunn, P. A., Ford, B. C. Effect of age of exposure and dietary acidification or alkalinization on broiler pulmonary hypertension syndrome. Journal of Applied Poultry Science, 244-252, 1994 December. [Article Link] - opens new window

Jensen, L. S., Dunn, P. A., and Dobson, K. N. Induction of oral lesions in broiler chickens by supplementing the diet with copper. Avian Diseases, 1991 Oct-Dec;35(4):969-73. [PubMed Link] - opens new window

Jackwood, M. W., Hilt, D. A., Dunn, P. A. Observations on colonial phenotypic variation in Bordetella avium. Avian Diseases 1991 Jul-Sep;35(3):496-504. [PubMed Link] - opens new window


  • Diagnostic pathology - avian species
  • Avian medicine - food producing avian species
  • Content expert in the Professional Examination
  • Service Review Team in creating, reviewing and validating questions for the National Board
  • Examination for Veterinary Medical Practice and Clinical Competency Tests in veterinary medicine
  • Question writer and grader for the annual certifying examination for the American College of Poultry Veterinarians


Characterization of Avian Pox in a Ruffed Grouse (Bonasa umbellus) from Pennsylvania
Avian Diseases, Robinson, Corissa A., Dunn, Patricia A., Williams, Lisa M., Poulson, Rebecca L., Miller, Erica A., Brown, Holly M., Brown, Justin D., 2021

A Highly Sensitive and Specific Probe-Based Real-Time PCR for the Detection of Avibacterium paragallinarum in Clinical Samples From Poultry
Frontiers in Veterinary Science, Kuchipudi, Suresh V., Yon, Michele, Surendran Nair, Meera, Byukusenge, Maurice, Barry, Rhiannon M., Nissly, Ruth H., Williams, Jen, Pierre, Traci, Mathews, Tammy, Walner-Pendleton, Eva, Dunn, Patricia, Barnhart, Denise, Loughrey, Sean, Davison, Sherrill, Kelly, Dona J., Tewari, Deepanker, Jayarao, Bhushan M., 2021

Complete genome sequences of seven avibacterium paragallinarum isolates from poultry farms in Pennsylvania, USA.
Microbiology Resource Announcements, Byukusenge, Maurice, Nissly, Ruth H., Li, Lingling, Pierre, Traci, Mathews, Tammy, Wallner-Pendleton, Eva, Dunn, Patricia, Barnhart, Denise, Loughrey, Sean, Davison, Sherrill, Kelly, Donna J., Tewari, BDeepanker, Jayarao, Bhushan M., Kuchipudi, Suresh V., 2020

Surveillance for heterakis spp. in game birds and cage-free, floor-raised poultry in Pennsylvania
Avian Diseases, Greenawalt, Denver, Yabsley, Michael J., Williams, Lisa, Casalena, Mary Jo, Boyd, Robert, Debelak, Erin, Wildlicka, Hanna, Phillips, Edward, Wallner-Pendleton, Eva, Dunn, Patricia, Brown, Justin, 2020

Molecular epidemiology of Marek’s disease virus in central Pennsylvania, USA
Virus Evolution, Bell, Andrew, Kennedy, David, Jones, Matthew, Cairns, Christopher, Pandey, Utsav, Dunn, Patricia, Szpara, Moriah, Read, Andrew, 2019

Diseases of the Duck, Dunn, Patricia, 2019

Molecular epidemiology of Marek’s disease virus in central Pennsylvania, USA
Virus Evolution, Bell, Andrew S., Kennedy, David A., Jones, Matthew J., Cairns, Christopher L., Pandey, Utsav, Dunn, Patricia A., Szpara, Moriah L., Read, Andrew F., 2019

Industry-wide surveillance of Marek’s disease virus on commercial poultry farms.
Avian Diseases, Kennedy, David A., Cairns, Christopher, Jones, Matthew J., Bell, Andrew S., Salathé, Rahel M., Baigent, Susan J., Nair, Venugopal K., Dunn, Patricia A., Read, Andrew F., 2017

Chapter 21: Special considerations for backyard flocks and the urban live bird marketing system, Dunn, Patricia, 2017

DNA from dust: Comparative genomics of large DNA viruses in field surveillance samples
mSphere, Pandey, Utsav, Bell, Andrew S., Renner, Daniel W., Kennedy, David A., Shreve, Jacob T., Cairns, Chris L., Jones, Matthew J., Dunn, Patricia A., Read, Andrew F., Szpara, Moriah L., 2016

Review of Nonfoodborne Zoonotic and Potentially Zoonotic Poultry Diseases
Avian Diseases, Agunos, Agnes, Pierson, F. William, Lungu, Bwalya, Dunn, Patricia A., Tablante, Nathaniel, 2016

Surveillance for pasteurella multocida in ring-necked pheasants (Phasianus colchicus) after an outbreak of avian cholera and apparently successful antibiotic treatment
Avian Diseases, Brown, Justin D., Dunn, Patricia, Wallner-Pendleton, Eva, Kariyawasam, Subhashinie, Schriner, Timothy, Hofacre, Charles, Johnson, Joshua, Boyd, Robert, 2016

Educational Program Development in Response to 2014-2015 Avian Influenza Outbreak
Poultry Science, Dunn, Patricia, 2016

Avian Influenza Info for Organic Poultry Producers: Facts, Context and the Case for Preparedness
Organic Matters, Dunn, Patricia, 2016

Isolation and molecular characterization of newly emerging avian reovirus variants and novel strains in Pennsylvania, USA, 2011-2014
Scientific Reports, Lu, Huaguang, Tang, Yi, Dunn, Patricia A., Wallner-Pendleton, Eva A., Lin, Lin, Knoll, Eric A., 2015

An observational study of the temporal and spatial patterns of Marek's-disease-associated leukosis condemnation of young chickens in the United States of America
Preventive Veterinary Medicine, Kennedy, David A., Dunn, John R., Dunn, Patricia A., Read, Andrew F., 2015

Diseases of Quail, Dunn, Patricia, 2015

Acute septicemia caused by streptococcus gallolyticus subsp. pasteurianus in Turkey Poults
Avian Diseases, Saumya, Dona, Wijetunge, S., Dunn, Patricia, Wallner-Pendleton, Eva, Lintner, Valerie, Matthews, Tammy, Pierre, Traci, Kariyawasam, Subhashinie, 2014

Successful establishment and global dispersal of genotype VI avian paramyxovirus serotype 1 after cross species transmission
Infection, Genetics and Evolution, Chong, Yee Ling, Lam, Tommy Tsan Yuk, Kim, Oekyung, Lu, Huaguang, Dunn, Patty, Poss, Mary, 2013

Fingerprinting of poultry isolates of Enterococcus cecorum using three molecular typing methods
Journal of Veterinary Diagnostic Investigation, Wijetunge, Dona Saumya, Dunn, Patricia, Wallner-Pendleton, Eva, Lintner, Valerie, Lu, Huaguang, Kariyawasam, Subhashinie, 2012