Surveillance on hemorrhagic fever with renal syndrome in Guizhou during 1984-2000 / 中华流行病学杂志

<p><b>OBJECTIVE</b>To explore the relations between different areas on hemorrhagic fever with renal syndrome (HFRS) in Guizhou.</p><p><b>METHODS</b>Various forms of infectious areas were surveyed continuously through epidemiologic surveillance system.</p><p><b>RESULTS</b>In fixed areas under surveillance system, the mean positive rate of HFRSV among Apodemus agrarius was 3.39%, comparing with Rattus norvegicus 1.61% in Apodemus infectious areas of Zunyi county, 3.19% in Rattus norvegicus, but no HFRSV of Apodemus agrarius was identified in Rattus infectious area of Shiqian county. Both Apodemus and Rattus infectious areas were relatively stabilized. In both banks of Luowang river, Kaiyang county, which had been identified as areas of infections for Apodemus in the eastern part, Rattus infectious area in the west, slow change was noticed. In 1983 - 1984 was not found in Apodemus agrarius HFRSV, however the infectious rate of HFRSV in Apodemus agrarius was 13.85% (Ag 1/65, Ab 8/65) in the western part of the province in 1995 - 1998.</p><p><b>CONCLUSION</b>Both Apodemus and Rattus infectious areas were stabilized but changed slowly. Mixed type and the result of mutual penetration were noticed.</p>

Study on ribotyping of Lyme borreliosis spirochete in Guizhou province / 中华流行病学杂志

<p><b>OBJECTIVE</b>To define the main genotypes in Guizhou agricultural areas by molecular epidemiologic investigation of 21 Borrelia burgdorferi sensu lato of Lyme disease spirochetes and to provide the scientific bases for formulating a preventive policy.</p><p><b>METHODS</b>Polymerase chain reaction (PCR) technique was used to amplify the 23S(rrl)-5S(rrf) intergenic spacer, and amplified products were analyzed by restriction fragment length polymorphism (RFLP) and nucleotide sequencing.</p><p><b>RESULTS</b>There were two genospecies in the strains: 20 strains belong to Borrelia valaisiana, 1 strain is Borelia sp.</p><p><b>CONCLUSION</b>Borrelia valaisiana was the main genotype in Guizhou agricultural areas. The harmness of B. valaisiana to human being has been confirmed. In order to efficiently prevent the harmness of agent to the people in Guizhou agriculture areas, we should study the risk further.</p>