Invasive Species Compendium

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Abstract

Equine viral diseases in the Pantanal, Brazil. Studies carried out from 1990 to 1995.

Abstract

The results of serological surveys involving 3767 horses are presented. Seropositivity for equine adenovirus was 42%; seroprevalence was highest among animals <3 years of age (61.9%). Seroprevalence of equine herpesvirus 1 (EHV-1) was 36%; foals represented 50% and mares 22.22% of seropositive horses. Seropositivity for EHV-4 was 58% (foals 55.17% and mares 24.13%). 18% of horses were seropositive for equine rhinovirus 1. Foals aged 1 to 2 years (22.2%) had a titre of 1/5. Titres of 1/10 and 1/20 were only observed in horses >5 years old. Seropositivity for influenza A/Equine/2/Miami was 30%; foals represented 40% and mares 28.6% of all seropositive animals. 42% of horses were seropositive for influenza A/Equine/2/Fontainebleau; foals and mares represented 86% (43% in each group) of all seropositive animals. The seroprevalence of equine infectious anaemia was 24.8%; seropositivity was 14.3% among males and 10.6% among females. Neutralizing antibodies to eastern equine encephalomyelitis (6.7%), western equine encephalomyelitis (1.2%) viruses, Ilheus flavivirus (26.6%), Maguari (28.2%) and Tacaiuma (15.7%) bunyaviruses were observed. Equine viral arteritis was not found in this region.