The authors present mass incidence of respiratory diseases in two studs caused by Streptococcus equi subsp. zooepidemicus (5. zooepidemicus) together with results of laboratory investigations. In the first stud during the winter period 45 out of 65 weaned foals had lacrimation, serous nasal discharge, coughing and enlarged submandibular lymph nodes. Initially, after antibiotic treatment longlasting symptoms and recurrent fever were seen. After having the results of in vitro antibiotic resistance test, the use of penicillin and streptomycin resulted in recovery within 2-3 days following treatment. In the second stud in May among weaned foals arrived from abroad conjunctivitis and fever of 38.5-39 °C were observed, followed in 1-2 days by upper respiratory symptoms. In ten days the race horses showed bad performance, and in 1-2 days showed similar symptoms. Some mares and suckling foals became ill, too. No death attributable to 5. zooepidemicus was observed in either stud. Bacteriological examination of nasal discharges resulted in isolation of S. zooepidemicus in the first stud in 2, in the second stud in 5 cases, respectively. Antibiotic resistance test of 5. zooepidemicus isolated in the first stud showed intermediate sensitivity to the antibiotics (oxytetracycline or gentamycine) used for the initial treatment of the foals. Virological examinations were negatíve in either stud. Results of serological tests revealed specific titre rise in paired serum samples in the first stud to EHV-1, Myxovirus influenzae equi A2 Miami and ERBV-1, and in the second stud to EHV-1, EHV-4, EVA, ERAV and ERBV-1, respectively. These results showed the circulation of these respiratory viruses in the studs, but in the respiratory diseases could only play predisposing role. This is the first report on the occurrence of EHV-4, ERAV and ERBV-1 infections in Hungarian studs.
|Number of pages||7|
|Journal||Magyar Allatorvosok Lapja|
|Publication status||Published - Mar 1 2013|
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