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An outbreak of haemorrhagic septicaemia associated with Pasteurella multocida subsp. gallicida in a large pig herd


, : An outbreak of haemorrhagic septicaemia associated with Pasteurella multocida subsp. gallicida in a large pig herd. Australian Veterinary Journal 73(1): 27-29

The case report of an outbreak of P. multocida subsp. gallicida in an intensive 1450-sow, farrow-to-finish pig herd in south-east Queensland, Australia, between April and October 1994 is presented. Other subspecies of P. multocida were isolated from the dead pigs, and also Actinobacillus pleuropneumoniae, during the later stages of the outbreak. The infection was thought to have been introduced by wildfowl (Dendrocygna arcuata and Anseranas semipalmata) present on the dams and effluent ponds around the piggery due to drought conditions, and exacerbated by overcrowding. The first deaths occurred in a weaner room, and over a 2-week period 33/550 pigs aged 7-8 weeks died. Further deaths followed, most pigs dying within 12-24 h of the onset of clinical signs. After ca. 3 weeks, a consulting veterinarian visited the farm, and antibiotic treatment of the weaners, growers, finishers and sows was begun immediately, both parenterally, and with medicated feed and water. The antibiotic treatment was adjusted a few weeks later, and various other hygiene measures were taken. With the exception of suckling piglets, mortalities in all age groups peaked 8-10 weeks after the onset of the outbreak, and declined over the next 7 weeks. Further effects were seen in decreased successful farrowing rates, increased piglet death rates, and increased rates of return to service by sows which had survived the outbreak (>20% compared with 10%). The final estimated loss attributed directly to the disease was 1653 weaner to finisher pigs, 193 sows and 732 suckling piglets.

US$19.90

PMID: 8660187

DOI: 10.1111/j.1751-0813.1996.tb09949.x


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