Epidemiological analysis on malaria incidence in Zhejiang,2010-2013

Objective To understand the incidence pattern of malaria in Zhejiang province from 2010 to 2013,and provide a scientific evidence for malaria elimination. Methods The incidence data of malaria in Zhejiang from 2010 to2013 were collected from national disease reporting information system and epidemiological investigation. Results A total of 603 malaria cases were reported,including 200 vivax malaria cases,395 falciparum malaria cases,6 ovale malaria cases,1 quartan malaria case and 1 mixed infection case. Among the reported cases,10( 1. 66%) occurred in local people( 1. 66%),593( 98. 34%) were imported cases,and no local malaria case has been found since 2012.Malaria cases were reported every month,and the case number during May-October was not significantly different from that in other months( χ2= 3. 254,P = 0. 354). The cases mainly distributed in Jinhua,Hangzhou,Wenzhou,Lishui and Ningbo,the cases in these areas accounted for 76. 45% of the total( 461 /603). Most cases were 20 to 49 years old,accounting for 80. 10% of the total( 483 /603) and the male to female ratio of the cases was 6. 9 ∶ 1. The infection sources were mainly from malaria endemic regions of Africa and Asia, accounting for 70. 98% and 16. 92%.Conclusion The local malaria transmission have been controlled in Zhejiang. However,imported malaria becomes a major challenge. It is still necessary to strengthen the malaria surveillance and health education among risk population.