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

18 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, 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, 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.

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

Lorello O, Foster DL, Levine DG, Boyle A, Engiles J, Orisini J Clinical treatment and prognosis of equine odontoclastic tooth resorption and hypercementosis Equine Vet Journal 48: 188-94, 2016.

Boyle AG, Rankin SC, Duffee L, Boston RC, Aceto HW. S. equi detection PCR assay for equine nasopharyngeal and guttural pouch wash samples. JVIM 30: 276-281., 2016.

Duffee LR, Stefanovski D, Boston RC, Boyle AG Predictor variables for Streptococcus equi subspecies equi diagnosis and complications in horses: 108 cases ( 2005-2012) JAVMA 247: 1161-8, 2015.

Boyle AG, Magdesian KG, Gallop R, Sigdel S., Durando, MM Saccharomyces boulardii viability and efficacy in horses with antimicrobial-induced diarrhoea. Vet Rec. doi:10.1136/vr.100833, : , 2012.

Boyle Ashley G, Boston Ray C, O'Shea Kathleen, Young Sheri, Rankin Shelley C Optimization of an in vitro assay to detect Streptococcus equi subsp. equi. Veterinary microbiology 159: 406-10, 2012.

Boyle Ashley G, Sweeney Corinne R, Kristula Michaela, Boston Ray, Smith Gary Factors associated with likelihood of horses having a high serum Streptococcus equi SeM-specific antibody titer. Journal of the American Veterinary Medical Association 235: 973-7, 2009.

Rothacker Caitlin C, Boyle Ashley G, Levine David G Autologous vaccination for the treatment of equine sarcoids: 18 cases (2009-2014). The Canadian veterinary journal = La revue veterinaire canadienne 56: 709-14, 2015.

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