PRESENCE OF RESPIRATORY VIRUSES IN EQUINES IN BRAZIL

Revista do Instituto de Medicina Tropical de São Paulo

Dalva Assunção Portari Mancini¹  Aparecida Santo Pietro Pereira¹  Rita Maria Zucatelli Mendonça¹  Adelia Hiroko Nagamori Kawamoto¹  Rosely Cabette Barbosa Alves¹  José Ricardo Pinto¹  Enio Mori¹  Leonardo José Richtzenhain¹  Jorge Mancini-filho¹ 

关键词: Parainfluenza virus;    Influenza virus;    Serology;    Hemagglutination inhibition test;    Equines;   

DOI  :  10.1590/S0036-46652014000300002

来源: SciELO

【 摘 要 】

Equines are susceptible to respiratory viruses such as influenza and parainfluenza. Respiratory diseases have adversely impacted economies all over the world. This study was intended to determine the presence of influenza and parainfluenza viruses in unvaccinated horses from some regions of the state of São Paulo, Brazil. Blood serum collected from 72 equines of different towns in this state was tested by hemagglutination inhibition test to detect antibodies for both viruses using the corresponding antigens. About 98.6% (71) and 97.2% (70) of the equines responded with antibody protective titers (≥ 80 HIU/25µL) H7N7 and H3N8 subtypes of influenza A viruses, respectively. All horses (72) also responded with protective titers (≥ 80) HIU/25µL against the parainfluenza virus. The difference between mean antibody titers to H7N7 and H3N8 subtypes of influenza A viruses was not statistically significant (p > 0.05). The mean titers for influenza and parainfluenza viruses, on the other hand, showed a statistically significant difference (p < 0.001). These results indicate a better antibody response from equines to parainfluenza 3 virus than to the equine influenza viruses. No statistically significant differences in the responses against H7N7 and H3N8 subtypes of influenza A and parainfluenza 3 viruses were observed according to the gender (female, male) or the age (≤ 2 to 20 years-old) groups. This study provides evidence of the concomitant presence of two subtypes of the equine influenza A (H7N7 and H3N8) viruses and the parainfluenza 3 virus in equines in Brazil. Thus, it is advisable to vaccinate equines against these respiratory viruses.

【 授权许可】

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