Objective To investigate the natural hosts of scrub typhus and the parasitism status on their body surface in Ganzhou, Jiangxi province, China, and to provide a scientific basis for the prevention and control of scrub typhus in the area. Methods In Ganzhou, the host animals were captured in four surveillance sites (Yudu, Xunwu, Ganxian, and Shangyou counties) from September to October in each of 2015 and 2016 using the trap-at-night method. The species of the hosts was identified. The chigger mites on their body surface were subjected to comb inspection to identify the species and calculate chigger index. Results A total of 429 small animals (7 species) were captured, with a capture rate of 8.95%. Of the 7 species, Rattus losea was the dominant species, accounting for 51.75%. There were 188 host animals with chigger mites, and the host animals with chigger mites were mostly R. losea, with an overall chigger infestation rate of 43.82%. The chigger infestation rate was higher in Apodemus agrarius, R. norvegicus, and R. losea. A total of 2 875 chigger mites were captured, with a chigger index of 6.70, and R. norvegicus, A. agrarius, and R. losea had a higher chigger index. The species identification of parasitic mites in the 188 host animals showed that there were 5 species of chigger mites, and Leptotrombidium deliense was the dominant species, accounting for 61.70%. Conclusion Ganzhou is possibly a natural focus of scrub typhus, and the dominant host animal and vector are R. losea and L. deliense, respectively. It is necessary to conduct etiological and epidemiological study for the confirmation and futher evidences on the prevention and control of scrub typhus.

Objective To analyze the epidemiological characteristics of the first indigenous dengue cases in Jiangxi province, China, to evaluate the efficacy of the prevention and control strategies, and to provide a basis for the prevention and control of dengue fever. Methods The information of the first indigenous dengue cases in Jiangxi province from September to October, 2017 was collected for descriptive analyses. Serum samples of the cases and Aedes albopictus larvae were collected for the detection of viral nucleic acids. Serum samples of healthy people in the core area were collected for IgG antibody detection. The results of mosquito prevention and elimination were evaluated by Breteau index (BI) and the double mosquito net method. Results The three dengue patients were all infected with dengue virus type Ⅱ. The time interval between onsets of fever was 17 days. None of them had travel history. A total of about 1 000 Ae. albopictus larvae samples were tested and turned out to be negative. In the core area, 3.00% of the healthy people were positive for dengue IgG. After the elimination of adult mosquitoes and breeding sources in the core area and the warning area, BI decreased from 22.43 at the first surveillance to 0.98 at the ninth surveillance; the mean biting index was controlled no higher than 2 mosquitoes/person·hour in the core area. Conclusion The outbreak is the first indigenous dengue infection in Jiangxi province. It has been effectively controlled by appropriate epidemic management.

【Abstract】 Objective Analyze the prevalent trend of hemorrhagic fever with renal syndrome(HFRS) in Pingyi county, and provide scientific basis for prevention and control of the disease. Methods Epidemiological trends of HFRS in Pingyi county was analyzed with the method of descriptive epidemiology based on the HFRS case data and the surveillance information of host from 1980 to 2006. Results From 1980-2006, there were 9519 cases of HFRS were reported, the average annual incidence rate of this disease was 26.28/100 000, and 277 cases were died with the morbidity of 2.91%. The peak of incidence rate was from 1992 to 1998. The prevalence of HFRS varied periodically and the prevalence period was about 3-5 years, which mostly focused on the spring, fall and winter. It often occurred in low plains with rivers, and the patients were mostly the males who were young and strong. The prevalence trend gradually decreases, and its mortality in autumn and winter was higher than in spring. The rodent density was in the peak in the third quarter and the rate of rodent carrying virus was the highest in the fourth quarter. Conclusion The prevalence of HFRS in Pingyi county had the characteristic of periodicity, seasonal and multitudinous. In recent years, though the HFRS morbidity and incidence rate gradually decreased, the crowd morbidity, mice density and the rate of mouse carrying virus still maintained at the high level. In order to control HFRS, the integrated control measure must be taken including deratization  in the spot and the inoculation of HFRS vaccine in the key crowd.

The changes of protein composition of hemolymph of Culex pipiens quinquefasciatus (Say,1823)and Aedes albopictus(Skuse,1849)in their larval and pupal stages were studied with SDS-PAGE.there are 13,22,15,14 and 15,12,22,23.protein bands In the hemolymph of 3-4 insta larvaesas well as female and male pupaes respectively,Among their larval and pupal stages or every stage there are the same protein bands and molecular weights the different major protein bands and molecular weights also and there exsiting.