EPIDEMIOLOGICAL STUDY OF SALMONELLA INFECTION IN SELECTED LAYER FARMS WITH ISOLATION, IDENTIFICATION AND ANTIBIOGRAM STUDY OF IDENTIFIED ISOLATES

Abstract

The present study was conducted to determine the seroprevalence of Salmonella infections in selected layer farm. This study covered cultural prevalence with isolation and identification of the causal agent of Salmonellosis in layer farms of Rangpur district during January-June 2011. The overall seroprevalence of Salmonella by Serum Plate Agglutination test was 40.41% .In flock no. 1, the prevalence of Salmonella infection was 40.32% at first sampling but it increased to 44.23% at second sampling (2 months later first sampling). The prevalence of Salmonella infection also increased from first sampling to second sampling from 37.40% to 45.45% in flock no. 2, 36.53% to 46.66% in flock no. 3, 38.18% to 43.33% in flock no. 4 and 32.72% to 39.34% in flock no. 5. A total 498 isolates originating from various tissues and environmental samples were characterized, among them 60% were Salmonella pullorum, 20% were Salmonella gallinarum and 20% were Paratyphoid group of Salmonellae. Seasonal prevalence of Salmonellosis was higher in summer (26.89% ) than the winter season( 20.25%). From the antibiogram study it was revealed that all of the isolates were sensitive to gentamicin (100%), ciprofloxacin (100%), followed by norfloxacin (90%), tetracycline (60%), streptomycin (30%) and amoxycillin (30%) penicillin G and apicillin are resistance.