Epidemiological analysis of newly emerging leprosy cases after general elimination of leprosy in Wenzhou city, Zhejiang

ObjectiveTo determine the epidemiological characteristics and trends of leprosy after its general elimination in Wenzhou, Zhejiang from 1992 to 2008. MethodsAnalysis was based on the data derived from municipal registration forms, yearly reports and individual medical records for leprosy cases. ResultsA total of 19 newly emerging leprosy cases were detected during the 17-year period from 1992 to 2008 with the annual average rate of 0.022/lakh. Seven cases were found in 2008 with the rate of 0.09/lakh, suggesting substantial increase. The male to female ratio was 18∶1, the average age detected (35.77 9.66) years, the average delay (73.56 75.66) months, and the proportion of multibacillary (MB) to paucibacillary (PB) leprosy 3.75∶1. Floating population accounted for 68.42% of cases. ConclusionThe epidemiologic pattern of leprosy, generally eliminated in the area, has been relatively stable in Wenzhou city from 1992 to 2008. Despite substantial rocketing in 2008, the prevalence of leprosy remained low in Wenzhou city. Therefore, surveillance on leprosy among floating population, as well as active detection in conjunction with passive case finding, should be further strengthened to achieve early detection, early treatment, control of transmission and prevention of malformation.