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


Assistant Professor of Large Animal Medicine and Neurology , University of Pennsylvania, New Bolton Center, Kennett Square, PA

Diplomate, American College of Veterinary Internal Medicine - Large Animal

Diplomate, American College of Veterinary Internal Medicine - Neurology

Clinical Specialties: Large Animal Internal Medicine and Neurology
Research Areas: Large animal neurology, equine neurology, bovine neurology, camelid neurology, small ruminant neurology, porcine neurology, Clostridium botulinum type B and botulism, Sarcocystis neurona, equine protozoal myeloencephalitis, Borrelia burgdorferi, Lyme neuroborreliosis

Contact Information:
University of Pennsylvania
School of Veterinary Medicine
Dept of Clinical Studies
New Bolton Center
382 West Street Road

Large Animal Internal Medicine & Neurology

Botulism, Neurology, Equine protozoal myeloencephalitis (EPM). Lyme neuroborreliosis

Setlakwe E, Johnson AL*. Acute encephalopathy in a 2-year-old pot-bellied pig following accidental intoxication with clonazepam. J Vet Emerg Crit Care : , 2017.

Mittelman NS, Divers TJ, Engiles JB, Gerhold R, Ness S, Scrivani PV, Southard T, Johnson AL*. Parelaphostrongylus tenuis cerebrospinal nematodiasis in a horse with cervical scoliosis and meningomyelitis. J Vet Intern Med : , 2017.

Luethy D, Slack J, Kraus MS, Gelzer AR, Habecker P, Johnson AL*. Third-degree atrioventricular block and collapse associated with eosinophilic myocarditis in a horse. J Vet Intern Med : , 2017.

Reed SM, Furr M, Howe DK, Johnson AL, MacKay RJ, Morrow JK, Pusterla N, Witonsky S Equine protozoal myeloencephalitis: an updated consensus statement with a focus on parasite biology, diagnosis, treatment, and prevention J Vet Intern Med 30: 491-502, 2016.

Sato Y, Wigle WL, Gallagher S, Johnson AL, Sweeney RW, Wakenell PS Outbreak of type C botulism in commercial layer chickens Avian Dis 60: 90-4, 2016.

Mittelman NS, Engiles JB, Murphy L, Vudathala D, Johnson AL*. Presumptive iatrogenic microcystin-associated liver failure and encephalopathy in a Holsteiner gelding. J Vet Intern Med 30: 1747-1751, 2016.

Johnstone LK, Engiles JB, Aceto H, Buechner-Maxwell V, Divers T, Gardner R, Levine R, Scherrer N, Tewari D, Tomlinson J, Johnson AL*. Retrospective evaluation of horses diagnosed with neuroborreliosis on postmortem examination: 16 cases (2004-2015). J Vet Intern Med 30: 1305-12, 2016.

Johnson AL, McAdams-Gallagher SC, Aceto H Accuracy of a mouse bioassay for the diagnosis of botulism in horses J Vet Intern Med 30: 1293-9, 2016.

Tomlinson JE, Reef VB, Boston RC, Johnson AL* The association of fibrinous pleural effusion with survival and complications in horses with pleuropneumonia (2002-2012): 74 cases J Vet Intern Med 29: 1410-7, 2015.

Tomlinson JE, Byrne E, Pusterla N, Magdesian KG, Hilton HG, McGorum B, Davis E, Schoster A, Arroyo L, Dunkel B, Carslake H, Boston RC, Johnson AL* The use of recombinant tissue plasminogen activator (rTPA) in the treatment of fibrinous pleuropneumonia in horses: 25 cases (2007-2012) J Vet Intern Med 29: 1403-9, 2015.

BA University of Pennsylvania, 1999

DVM Cornell University College of Veterinary Medicine, 2003