Objective To determine the population composition of rodents and fleas and investigate plague in the natural foci in Longlin county, Guangxi Zhuang Autonomous Region for formulation of prevention and control strategies. Methods The flea-carrying rate and flea index of rodents were calculated based on the number of fleas collected from caged rodents. The free flea index was calculated according to the number of indoor fleas captured on sticky paper. The mammals were then subject to etiological and serological tests to determine the infection rate. Results Rodents of eleven species (3 families with 2 orders) and fleas (6 species) predominantly Rattus tanezumi and Xenopsylla cheopis were found in the foci. The average rodent density, flea-carrying rate, flea index and index of X. cheopis were 3.24%, 27.09%, 0.95 and 0.74, respectively. The indoor free flea index was 0.046. Among 5398 cultured rodent specimens, 10 strains of Yersinia pestis were isolated; two positive sera and 24 indicative sera were detected via indirect hemorrhagic assay (IHA). Conclusion The optimum period for rodent control is April and October and the key period for plague monitoring is from February to October in the natural foci of R. tanezumi plague in Longlin county.

【Abstract】 Objective To study killing effects to rodents in large reservoir region, and provide scientific basis for rodent control.  Methods 0.1% sodium diphacinone was given indoor, and 0.005% Bromadiolone  outdoor in the Pingban reservoir region. 0.005% Bromadiolone baits were given in the outdoors of the Baise reservoir, Ertan reservoir and Changzhou reservoir region, while 0.0375% Racumin wheat baits was taken in the indoor and outdoor of Longtan reservoir region.  Results The killing rate was 83.89% in the Pingban reservoir, 83.40% in the Baise reservoir, 92.82% in the Ertan reservoir, 86.65% in the Longtan reservoir and 89.35% in the Changzhou reservoir region.  Conclusion Bromadiolone and Racumin had good killing effect on rodents in reservoir region, and the integrated control measure was taken to reduce effectively the rodent density.

Objective To know the main plague reservoirs and vectors,and to identify the distributive region and the features of plague foci in Longlin and Xilin counties of Guangxi province. Methods The investigations were carried out in 53 villages with epidemiology methods. Rodents,fleas and plague indicative animals were collected for isolating Yersinia pestis and detecting of F1 antibody. Results The 10 species in 3 families of the 2 orders of the rodents and the 6 species of fleas were identified in the areas. Rattus flavipestus and Xenopsylla cheopis were the dominant species. The 25 strains Y.pestis were isolated from R.flavipestus and the 31 positive animals serums of F1 antibody were detected. Conclusion Based on the factors of geography,reservoirs,vectors and pathogens. The plague foci exist in Longlin and Xilin county of Guangxi province. The plague foci in the areas have the same feature with the plague foci of R.flavipectus.