Characterisation of Clostridium perfringens isolated from chickens in Vietnam

Thi TN, Vu-Khac H, Duc TN (2021): Characterisation of Clostridium perfringens isolated from chickens in Vietnam. Vet Med-Czech 66, 431–439.

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The objective of this study was isolating and characterising Clostridium perfringens from chickens in Vietnam and identifying virulence factors involved with enteritis. Five hundred thirty-one faecal and sixty-eight intestinal samples were collected from healthy and diseased chickens for the C. perfringens isolation. The presence of virulence factors was determined by multiplex PCR. The netB gene of the selected isolates was sequenced and checked for its expression by SDS-PAGE. Two hundred seventy-two C. perfringens isolates were collected. All of them were shown to be positive for the cpa gene. The netB gene was detected in 26.56% of the C. perfringens isolates from the healthy chickens, while 43.45% of the isolates from the faeces and 45% of the isolates from the intestinal samples were positive for this gene in the diseased birds. All eight isolates positive to netB from the diseased chickens showed 100% identity in the netB sequence and produced the NetB toxin in vitro, whereas only two out of eight healthy chicken-derived isolates produced this toxin. Nine out of ten chickens experimentally infected with the C. perfringens netB-positive isolate showed typical signs of enteritis. The cpa gene was the most prevalent virulence factor identified in the bacteria C. perfringens, but the netB gene could be a major player responsible for necrotic enteritis progression in chickens.

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