Abstract:
Serological screening using the ELISA blocking test
on 114 serum samples taken from cattle that haven’t been vaccinated had
positive results for bovine viral diarrhoea virus (BVD-MD) at a percentage
of 43% and for rhino-tracheitis virus (IBR-IPV), the percentage was of
68.42%. The positive results can be explained by the presence of the virus
in herds, where the diseases have a subclinical evolution. The serologic
investigation using the ELISA blocking test has established the serological
prevalence of infections with BVD-MD and IBR-IPV in three farms from
Moldavia, the highest prevalence being registered in the case of rhinotracheitis
virus (IBR-IPV). The presence of positive reactions, corroborated
with the lack of clinical signs in herd can be explained by the presence of
latent infections. A wide variety of stimuli such as stress, transport and
treatment with corticosteroids may lead to the reactivation of the disease
from latency. The obtained results suggest that an extension of serologic
investigations in more farms was necessary for finding the animals with
subclinical forms.
