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Disease Information

Current information on infectious diseases of horses is listed here. More information may be available at the office of your state veterinarian.


To learn more about how certain diseases are transmitted, see

Iatrogenic vs Natural Transmission


Anthrax (Bacillus anthracis)

Anthrax in Horses, UKY

Overview of Anthrax, Merck Vet Manual

Anthrax, OIE

Blastomycosis (Blastomyces dermatitidis

Systemic blastomycosis in a horse, Journal of Veterinary Diagnostic Investigation

Botulism (Clostridium botulism, types A, B, C, D) 

Botulism, AAEP

Botulism: A Deadly Disease That Can Affect Your Horse, UKY

Brucellosis (Brucella abortus) 

Brucellosis in the Horse, Bell Equine

Clostridial Enteritis

Clostridial Diarrhea in Adult Horses, AAEP


Coronavirus Owner Factsheet

Dermatophilosis or Streptothricosis (Dermatophilus congolensis

Overview of Dermatophytosis, Merck Vet Manual

Eastern Equine Encephalitis (Eastern equine encephalomyelitis virus)

EEE Owner Factsheet

Arboviruses, AAEP

USDA/APHIS Annual Report: EEE 2015

USDA/APHIS Annual Report: EEE 2016

Equine herpesvirus 1 & 4 related diseases (equine herpesvirus 1 & 4, equine rhinopneumonitis virus)

EHV Owner Factsheet 

EHM Owner Factsheet 

Equine Herpesvirus Resources, AAEP

Equine Herpesvirus 1 & 4 Related Diseases, AAEP

IDOHC EHM Guidance Document, USAHA

Equine infectious anemia (Equine infectious anemia virus) 

EIA Owner Factsheet

EIA AAEP Guidelines

Equine Infectious Anemia (EIA) Factsheet, APHIS

USDA/APHIS Annual Report: EIA 2018

Equine influenza (A/Equine/1/Prague 56 [H7N7] and A/Equine/2/Miami 63 [H3N8] 

Equine Influenza Owner Factsheet

Equine Influenza Virus, AAEP

Equine piroplasmosis (T. equi, B. caballi

EP Owner Factsheet

Equine Piroplasmosis Factsheet, APHIS

Theileriosis, OIE

Equine Protozoal Myeloencephalitis (Sarcocystis neurona)

Overview of Equine Protozoal Myeloencephalitis, Merck Vet Manual 

Equine pythiosis (Pythium insidiosum

Equine Pythiosis, MSU

Equine viral arteritis (equine arteritis virus) 

Equine Viral Arteritis, AAEP

Leishmaniasis (Leishmania siamensis

Leishmaniasis, HorseDVM

Leptospirosis (Taylorella asinigenitalis) 

Leptospirosis in Horses, Merck Vet Manual

Lyme (Borrelia burgdorferi)

Lyme Disease Multiplex Testing for Horses, Cornell University

Mange (Demodex equi, Psoroptes equi

Mange in Horses, Merck Vet Manual

Pigeon Fever (Ulcerative lymphangitis) 

Pigeon Fever, AAEP

Potomac Horse Fever (Neorickettsia risticii)

Potomac Horse Fever, AAEP

Rabies (Rabies virus) 

Rabies Owner Factsheet

Rabies, AAEP

Overview of Rabies, Merck Vet Manual

Rhodococcus equi

Rhodococcus equi, AAEP

Ringworm (Microsporum equinum, M. gypseum, T. equinum

Overview of Dermatophytoses, Merck

Salmonellosis (various Group A, B, and C salmonellae) 

Salmonellosis, AAEP

Strangles (Streptococcus equi var. equi

Strangles Owner Factsheet

Streptococcus equi var. equi, AAEP

Vesicular stomatitis (Vesicular stomatitis virus, subtypes New Jersey and Indiana) 

Vesicular Stomatitis, AAEP

USDA/APHIS VSV Information

West Nile encephalitis (West Nile virus) 

WNV Owner Factsheet 

West Nile Virus, AAEP

2016 WNV Case Reports

Western Equine Encephalitis (Western equine encephalomyelitis virus) 

WEE Owner Factsheet

Arboviruses, AAEP


African horse sickness (African horse sickness virus)

More Information

Contagious Equine Metritis

More Information

Dourine (Trypanosoma equiperdum)

More Information

Equine piroplasmosis (T. equi, B. caballi)

More Information

More Information

Glanders (Burkholderia mallei)

More Information

Hendra (Equine Morbilivirus)

More Information

More Information

Surra (Trypanosoma evansi)

More Information

Venezuelan equine encephalomyelitis (virus subtypes 1AB, 1C, 1E)

More Information

More Information