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Epidemiology and reproductive outcomes of EHV ‐1 abortion epizootics in unvaccinated T horoughbred mares in S outh A frica
Author(s) -
Schulman M. L.,
Becker A.,
van der Merwe B. D.,
Guthrie A. J.,
Stout T. A. E.
Publication year - 2015
Publication title -
equine veterinary journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.82
H-Index - 87
eISSN - 2042-3306
pISSN - 0425-1644
DOI - 10.1111/evj.12264
Subject(s) - abortion , epizootic , epidemiology , medicine , outbreak , veterinary medicine , pregnancy , obstetrics , biology , virology , genetics
Summary Reasons for performing study Equine herpesvirus 1 ( EHV ‐1) is one of the most common causes of infectious abortion in mares. Analysing the demography of outbreaks and detailing subsequent reproductive performance of affected mares will assist in the management of future (threatened) epizootics. Objectives To examine the epidemiology and reproductive outcomes of 2 EHV ‐1 abortion epizootics with very different patterns of morbidity. Study design Epidemiological and reproductive data were analysed retrospectively following abortion epizootics associated with EHV ‐1, but initiated via different routes, among unvaccinated mares on 2 Thoroughbred farms in S outh A frica. Methods Aborting mares were assigned to either the EHV ‐1 abortion cohort via positive immunostaining (Farms 1 and 2) or quantitative PCR (Farm 2) on tissue samples, or to the non‐ EHV abortion cohort. Results During their respective epizootics, EHV ‐1 abortions affected 9/30 (30.0%) and 18/316 (5.7%) of the pregnant mares on Farms 1 and 2, respectively; there were also 25 (7.9%) non‐ EHV abortions on Farm 2. Epizootic differences included: durations (Farm 1 = 135 days; Farm 2 = 34 days), intervals between first and subsequent abortions (Farm 1 = 39 days; Farm 2 = 2 days) and intervals to confirmation of EHV ‐1 (Farm 1 = 40 days; Farm 2 = 2 days). The median (range) age of EHV ‐1 abortion mares (8.0; 5–18 years) in both epizootics was similar but significantly younger (P = 0.004) than the 25 non‐ EHV ‐1 abortion mares (11.0; 4–24 years) on Farm 2. Gestation stage (median; range) of EHV ‐1 (291.5; 277–313) and non‐ EHV ‐1 (211.9; 61–339 days) abortions were significantly different (P = 0.001). The post abortion complications and subsequent reproductive outcomes had no significant association with EHV ‐1 abortion. Conclusions The marked difference in morbidity between the 2 epizootics may be associated with routes of introduction or intervention strategy dictated by availability of molecular diagnostic techniques. Unexpectedly, EHV ‐1 was not more commonly associated with post abortion complications.