Isolation and investigation on antimicrobial susceptibility of Pasteurella multocida from chickens infected or suspected with pasteurellosis

Abstract

The study was performed to evaluate the situation of pasteurellosis in chickens and testing
the antimicrobial susceptibility of P. multocida to some antibiotics commonly used in poultry
respiratory disease prevention and treatment in some districts of Tien Giang province. Ninety
samples including chicken heart blood, lung and fibula were collected from April to November
2019 and sample test was carried out at the laboratory of Nam Bo Agriculture College. The
studied results showed that the infection rate of chicken with P. multocida was 48.15%; the
infection rate of chicken raising in the small-scale farms was higher than that of the chickens
raising in the large-scale farms (p <0.05) and the infection rate of chickens at 30 to 60 days
old was higher than that of the chickens in other age groups (p <0.05). Moreover, the P.
multocida isolates having high virulence accounted for 83.33%, no isolates was not virulent.
The P.multocida isolates were highly susceptible to marbofloxacin (94.44%) and florfenicol
(81.48%). However, the P. multocida isolates were strongly resistant to amox + clavulanic acid
(77.78%) and moderate resistance to doxycycline (44.44%).