New Bolton Center Kennett Square, PA
Emergencies & Appointments:
Ryan Hospital Philadelphia, PA


Board Certified – American College of Veterinary Internal Medicine

Associate Professor of Medicine, Section of Field Service, New Bolton Center, University of Pennsylvania

Clinical Specialties: Internal medicine, infectious disease, lameness, herd health
Research Areas: Strangles, Streptococcus equi infections in horses, Equine infectious Disease
PubMed Link
Contact Information:
University of Pennsylvania
School of Veterinary Medicine
Department of Clinical Studies
New Bolton Center
382 West Street Road

Equine Infectious Disease, especially Streptococcus equi equi (Strangles), Vaccination

20+ years of equine clinical practice including equine internal medicine residency training (UCDAVIS) from 2001-2004 and sports medicine/lameness training with the PennVet NBC Sports Medicine Department 2004-2005. Currently I practice all aspects of equine clinical practice including internal medicine, infectious disease, lameness, and herd health.

Boyle AG, O'Shea K, Stefanovski D, Rankin SC. Detection of Viable Streptococcus equi equi Using Propidium Monoazide Polymerase Chain Reaction J Equine Vet Sci 128: , 2023.

Morris ERA, Schroeder ME, Ferro PJ, Waller AS, McGlennon AA, Bustos CP, Gressler LT, Wu J, Lawhon SD, Boyle AG, Lingsweiler S, Paul N, Dimitrov K, Swinford AK, Bordin AI, Cohen ND. Development of a novel real-time PCR multiplex assay for detection of Streptococcus equi subspecies equi and Streptococcus equi subspecies zooepidemicus. Vet Microbiol 284: , 2023.

Martin KH, Redding LE, Boyle AG. Factors Influencing Equine Affiliate Opinion on Reporting of Equine Strangles in the United States J Equine Vet Sci 128: , 2023.

Boyle AG. Streptococcus equi Subspecies equi Vet Clin North Am Equine Pract. 39: 115-131, 2023.

Frosth S, Morris ERA, Wilson H, Frykberg L, Jacobsson K, Parkhill J, Flock JI, Wood T, Guss B, Aanensen DM, Boyle AG, Riihimäki M, Cohen ND, Waller AS. Conservation of vaccine antigen sequences encoded by sequenced strains of Streptococcus equi subsp. equi Equine Vet J 55: 95-101, 2023.

Martin KH, Redding LE, Boyle AG. Factors Influencing Veterinarian Opinion on Reporting of Equine Strangles in the United States J Equine Vet Sci 114: , 2022.

Boyle AG, Rankin SC, O’Shea K, Stefanovski D, Peng J, Song J, Bau H. Detection of Streptococcus equi subsp equi in Convalescent Guttural Pouch Lavage Samples Using a LAMP Microfluidic Device. JVIM : , 2021.

Boyle AG, Mitchell C, Stefanovski D, Waller AS. Horses Vaccinated with Live Attenuated Intranasal Strangles Vaccine Seroconvert to SEQ2190 and SeM. EVJ : , 2021.

Boyle AG, Timoney JF, Newton JR, Hines MT, Waller AS, Buchanan BR Streptococcus equi Infections in Horses: Guidelines for Treatment, Control, and Prevention of Strangles-Revised Consensus Statement Vet Intern Med. 32: 633-647, 2018.

Boyle AG Strangles and its complications. Equine Vet Education 29: 149-157, 2017.

Boyle AG, Rankin SC, Morris DO Prevalence of methicillin resistant Staphylococcus aureus from equine nasopharyngeal and guttural pouch wash samples. J Vet Intern Med. : , 2017.

Boyle AG, Smith MA, Boston RC, Stefanovski D SeM titers after natural outbreaks of Streptococcus equi equi in horses: a case-control study JAVMA 250: 1432-1439, 2017.

Boyle AG, Stefanovski D, Rankin SC. Determining optimal sampling site for Streptococcus equi subsp equi carriers using loop-mediated isothermal amplification BMC Vet Research 13: , 2017.

BA Smith College, 1996

DVM Cornell University, 2000


Board Certified – American College of Veterinary Internal Medicine

Littleton Large Animal Clinic (2000 to 2001)

University of California, Davis (2001 to 2004)
Resident in Large Animal Internal Medicine