Evidence map›Paper›PMID 42132354›Full record

ArticleJournal of veterinary internal medicine2026

Eastern equine encephalitis-104 horses (1979-2017).

Diego E Gomez, Gabriela Suarez, Demia J de Tonnerre, Martha F Mallicote, Jorge A Hernadez, L Chris Sanchez, Robert J Mackay

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Article in Journal of veterinary internal medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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4 · The record

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5 · Who and what money

Authors and funding

7 authors.

Diego E GomezDepartment of Internal Medicine, Abu Dhabi Equine and Camel Hospital (ADECH), Abu Dhabi, AD 00000, UAE.ORCID 0000-0001-7495-4868
Gabriela SuarezDepartment of Large Animal Clinical Sciences, University of Florida, College of Veterinary Medicine, Gainesville, FL 32611, United States.
Demia J de TonnerreNorthside Emergency Veterinary Service, Terrey Hills, NSW 2084,  Australia.ORCID 0000-0001-7104-7920
Martha F MallicoteDepartment of Large Animal Clinical Sciences, University of Florida, College of Veterinary Medicine, Gainesville, FL 32611, United States.ORCID 0000-0002-4450-9859
Jorge A HernadezDepartment of Large Animal Clinical Sciences, University of Florida, College of Veterinary Medicine, Gainesville, FL 32611, United States.ORCID 0000-0002-3096-4762
L Chris SanchezDepartment of Large Animal Clinical Sciences, University of Florida, College of Veterinary Medicine, Gainesville, FL 32611, United States.ORCID 0000-0001-7362-5325
Robert J MackayDepartment of Large Animal Clinical Sciences, University of Florida, College of Veterinary Medicine, Gainesville, FL 32611, United States.ORCID 0000-0001-8737-3018

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundEastern equine encephalitis (EEE) is a highly fatal neurologic disease of horses, but data describing clinical presentation, epidemiology, and prognostic factors are limited.

objectivesDescribe the clinicopathologic and epidemiologic features of horses with EEE and identify factors associated with survival. ANIMALS: One hundred four horses diagnosed with EEE presented with signs of diffuse brain disease.

methodsRetrospective case series of horses evaluated at a Veterinary Teaching Hospital (1979-2017). Medical records were reviewed for clinical findings, diagnostic results, and outcomes. Logistic regression assessed associations between demographic, epidemiologic, and clinicopathologic variables and survival. Generalized linear models evaluated associations between climatic variables and annual case count.

resultsMedian age was 1.4 years (0.1-13.4), predominantly Thoroughbreds and Quarter Horses. Most horses (66/104) presented during summer. In negative binomial regression adjusted for temperature and year, each 100-mm increase in annual precipitation was associated with a 43% increase in cases (IRR 1.43; 95% CI, 1.22-1.82; P < .001). Common findings included abnormal behavior (96%), hyperthermia (99%), recumbency (51%), and seizure-like activity (46%). Cerebrospinal fluid (CSF) abnormalities included discoloration (65%), high protein concentration > 80 mg/dL (80%), and neutrophilic pleocytosis (62%). Case fatality rate was 90% (94/104). Recumbency, seizure activity during hospitalization, band neutrophilia, monocytosis, and high CSF protein concentration and neutrophils were associated with death. CONCLUSIONS AND CLINICAL IMPORTANCE: Eastern equine encephalitis is a rapidly progressive, highly fatal neurologic disease of horses, with increased case numbers during periods of higher precipitation. Clinicopathologic findings, particularly recumbency, seizure-like activity, leukogram changes and CSF abnormalities, provide prognostic indicators to guide clinical decision-making and client communication.

Indexed as

Encephalomyelitis, Eastern EquineHorse DiseasesAnimalsEncephalitis Virus, Eastern EquineFemaleHorsesMaleRetrospective StudiesSeasonsalphavirusEEEencephalitideshorsesmortalityvaccination

Identifiers

PMID42132354
PMCPMC13173428

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.