Subclinical bovine vaccinia: An important risk factor in the epidemiology of this zoonosis in cattle

Research in Veterinary Science
Izabelle RehfeldZélia Inês Portela Lobato

Abstract

Bovine vaccinia (BV) is a zoonosis caused by Vaccinia virus (VACV) that mainly affects lactating cows and dairy farm milkers. The epidemiological role(s) of other cattle categories such as dry cows, bulls, and heifers in BV remains unclear. This study was performed to investigate VACV in affected dairy cattle herds and perifocal farms during an outbreak in Brazil. Crusts from lesions of cows' teats were collected from all farms with BV outbreaks. Milk, feces, blood, and serum were collected from symptomatic and asymptomatic lactating cows. Blood and serum were also sampled from other cattle categories (calves, heifers, dry cows, and bulls). The samples were tested for VACV by PCR, and to confirm VACV viability, VACV-positive samples were inoculated in BSC-40 cells and stained using immunoperoxidase. Neutralizing antibodies were investigated using plaque reduction neutralization test. Viral DNA was detected in milk, blood, and feces samples of symptomatic and asymptomatic dairy cows and in blood samples from other cattle categories on farms with and without confirmed BV outbreak. In affected farms, viable virus was identified in feces and milk samples from lactating cows and in blood samples from asymptomatic dry cows. Viable VA...Continue Reading

References

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Citations

Nov 16, 2017·Viruses·Jaqueline Silva de OliveiraGiliane de Souza Trindade
Mar 10, 2018·Viruses·Ana Carolina Diniz MatosZélia Inês Portela Lobato
Jan 6, 2021·Viruses·Natalia Ingrid Oliveira SilvaBetânia Paiva Drumond
Nov 4, 2021·Brazilian Journal of Microbiology : [publication of the Brazilian Society for Microbiology]·Lorena Ferreira SilvaFabiano José Ferreira de Sant'Ana

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