Some characteristics of pasteurellosis in the duck flocks raised at the households in Tam Duong district, Vinh Phuc province

Abstract

This study was carried out from September to December, 2019 in the duck floks raised at households, the studied result showed that the infection rate of duck ranged from 4.6% to 7.9%, and the mortality rate ranged from 43.5% to 62.5%. The first manifestation of the disease was the ducks suddenly died in the flocks. The clinical signs were fever, increased respiratory rate, depression, anorexia, ruffled feathers, head tucked into the wings, difficulty walking, drink lots of water, diarrhea, dirty of feathers around anus and mucous discharge from the mouth and nostrils. The gross lesions included: amount of peritoneal and pericardial fluids increasing; petechial and ecchymotic hemorrhages were common, such as: hemorrhages in the coronary band of heart, hemorrhages in the air sac membranes adjacent to lungs, the liver was swollen accompanied with multiple, small, necrotic foci, intestinal lumen revealed thickened yellowish necrotic mucous membrane and there were ecchymosis hemorrhages at the ileocecal junction. The results of the antibiotic test showed that, 100% of the P. multocida strains were susceptible with enrofloxacin, levofloxacin, norfloxacin and ceftazidime; however, the strains showed the high resistance rates to tetracycline (70.6%), doxycycline (58.8%), ampicillin (47.1%), streptomycin (41.2%), amoxicillin/clavulanic acid (35.3%), resistant rate of the strains with gentamicin and kanamycin was 17.6% and 23.5%, respectively. Therefore, further studies are needed to conduct for better understanding the characteristics of this disease and the pathogenic strains in Viet Nam.