Bibliographic citations
Jove, A., (2004). Evaluación de las cepas H120 y M48 en programas de vacunación contra bronquitis infecciosa aviar en pollos de carne [Tesis, Universidad Nacional Mayor de San Marcos]. https://hdl.handle.net/20.500.12672/2266
Jove, A., Evaluación de las cepas H120 y M48 en programas de vacunación contra bronquitis infecciosa aviar en pollos de carne [Tesis]. PE: Universidad Nacional Mayor de San Marcos; 2004. https://hdl.handle.net/20.500.12672/2266
@misc{renati/330220,
title = "Evaluación de las cepas H120 y M48 en programas de vacunación contra bronquitis infecciosa aviar en pollos de carne",
author = "Jove Martel, Ana Luisa",
publisher = "Universidad Nacional Mayor de San Marcos",
year = "2004"
}
The objective of this study was to determinate the protection level given by two commercial live of Infectious Bronchitis vaccines (strains M48 and H120) against experimental challenge with M41 strain, in four groups of chicks (Ross 308) with different vaccination programs G1 (M48), G2 (H120), G3 (M48/H120), G4 (H120/M48) and a control group G5 (without vaccination). Protection was measure through clinical signs, antibody levels, ciliary activity, histopathology and productive parameters after experimental challenge. Revaccinated groups were better protected against the onset of clinical signs, although they showed a diminished ciliary activity (first-thirth day after challenge) and microscopic damage (histologicaly change from minimal to moderate). We found that group G4 had a very effective protection level. fewer amount of respiratory signs (snores) and minimal to moderate microscopic tracheal damage They also recovered ciliary activity. This group had the best average body weight at the end of the experiment, they obtened 286 g body weight and 15 point of Index of Productive Efficiency more than G5. In the groups that were vaccinated only once, we saw Less protection levels, also more respiratory signs and microscopic lesions, less average weight and productive parameters statistically significant, (P<0,05). Furthermore, G5 showed a severe reaction after challenge, diminishing its productive parameters. The absence or presence of clinical signs or respiratory lesions after challenge against to BIA was not correlated to antibody titers in chicks. We think that under field conditions, vaccination with H120/M48 program would give a wide protection against IBV infections.
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