Study on the time limitation of carrying Yersinia enterocolitica by Periplaneta americana and flies
Huang, S.M.
Zhonghua Liu Xing Bing Xue Za Zhi 7(6): 327-328
1986
ISSN/ISBN: 0254-6450 PMID: 3815490 Document Number: 276844
The experiments of artificial infection of the cockroaches and flies with Y. enterocolitica showed that, the cockroaches (Periplaneta americana) could carry Y. enterocolitica on their body-surface for about 10 days and in the body-cavity for at least 30 days. Y. enterocolitica could be isolated from fecal specimens of Periplaneta americana up to 20 days after the insects were infected. Y. enterocolitica could be carried by flies for 6 to 7 days on their body-surface and for at least 41 days in their body-cavity. The results proved that Y. enterocolitica could stay, and even reproduce, in the body-cavity of the two kinds of insect. It was found that difficult to isolate Y. enterocolitica from these two kinds of insect by using direct cultivation method. The enrichment of the bacteria in a modified phosphate buffer medium at 4.degree.C, for 2 to 3 weeks could make the isolation successful.