Case report: An outbreak of Salmonella Typhimurium infection at one dairy farm in Chiba prefecture and prevention of the epidermics

Abstract

Between September and December in 1995, six adult cows and one young cow suffered from diarrhoea and fever and two of them died at farmer “A” in North District Veterinary Clinical Center, Chiba. Salmonella Typhimurium was isolated from the fecal samples of these cases. Further investigations showed that Salmonella Typhimurium was isolated from13 out of 44 animals without any clinically signs. According to results of sensitivity tests, Enphoxisacine was administrated to one of affected animals, and we had a successful results. Fecal examination of all the animals, investigation of the environmental contamination with the bacteria, improvement of the animal hygiene systems, administrations of biological medications and antibiotics were continuously performed at this farm. To prevent further outbreaks, the neighboring farms were also informed with this case and cautioned by the corresponding authority. No further clinical cases were observed in this farm as well as neighboring farms after November 1995, and carrior animals with Salmonella Typhimurium were not identified after March 1996. Since some infected animals became bacteria-free without anitibiotic treatment, the necessity and execution of the anitibitic medication against carrier animals with Salmonella Typhimurium will remain unanswerably.