[A study of ecology of Plesiomonas shigelloides].

In order to understand further about its natural character for Plesiomonas Shigelloides (Ps) and the disease caused by this bacterial genus, we reported a special studying about ecology of Ps. We tested 398 samples from different natural water 99 strains of Ps were isolated, the average positive rate is 24.87%, the highest positive rate is in sewage-water samples. The genus of Ps can be isolated in all seasons, this rate is more in summer than in winter, its rate in pig is 2.56%, duck 21.70%, fish of fresh-water 29.22%, decorative animal 32.35%. This study have proved that Ps has birds natural host. Its positive rate is 14.70% in all population, 13.15% in diarrhoea patient, there is no significance difference (chi 2 = 0.40 P greater than 0.05), between normal and diarrhea patients. Positive rate in rural is more than city, and children higher than adult. By all 50 O sera we found that 71.08%, strains was serotype however, they fell into 42 O ser-types.