STUDY ON BIOLOGICAL CHARACTERISTICS OF BACTERIA STRAINS ACTINOBACILLUS PLEUROPNEUMONIAE ISOLATED FROM PIGS SUFFERING FROM PNEUMONIA RAISED IN HIEP HOA DISTRICT, BAC GIANG PROVINCE

Abstract

The results showed that the rate of pneumonia in pigs in Hiep Hoa district, Bac Giang province was 28.91% and the death rate was 18.41%. 91 samples were taken from pigs suspected to be infected with pneumonia by four age groups, all of which isolated A. pleuropneumoniae. The isolation rate of A. pleuropneumoniae is 14.29%; the highest rate of A. pleuropneumoniae isolation in pigs after weaning from 1.5 to 3 months of age was 30.0% and the lowest in newborn pigs to 1.5 months of age was 8.0%. The isolated A. pleuropneumoniae has biological characteristics consistent with the characteristics of bacteria described in all previous publics as ability to catch gram-negative color, urease reaction, catalase, oxidase, CAMP, O.N.P.G, Indol account for 100% in the test samples, do not grow on MaConkey agar medium. Among 13 isolates, 7 strains belong to serotype 2, accounting for 53.85%; 4 strains of serotype 5a accounted for 30.77%; 1 strain of serotype 5b accounts for 7.69%. The strains of A. pleuropneumoniae are highly susceptible to antibiotics such as ceftiofur, florfenicol, amoxicillin, ofloxacin and are resistant to some antibiotics such as neomycin, colistin, tetracycline.