论文部分内容阅读
Background: China shares boarder with many Dengue endemic areas.Rapid response to clusters and outbreaks is necessary to prevent establishment of local transmission.We responded to 1 confirmed dengue patient who worked at construction site to determine the magnitude of, and control, the possible outbreak.Methods: We defined a suspected case as acute onset of fever (≥38℃), with ≥ 1 of the following: headache, retro-orbital pain, muscle or joint pain between September 10 and October 10, 2010.A confirmed case was a suspected case with serum anti-dengue IgM (+).We searched for cases in hospitals and among construction workers and in the neighborhood.We compared the attack rates by work area and dormitory.We determined Breteau Index for Aedes albopictus.Results: We identified 24 cases (9 confirmed), all among construction workers (attack rate=7%, 24/331) with onset during September 10-October 18, 2010.Of 118 workers who worked at Area A, the attack rate was 12%, higher than among 160 workers who worked at Area B (0.63%, 1/160) (RR=24, 95% CI: 3.3-180).Among workers who worked at Area A, 42 worked only above the 10th floor of the buildings, of whom none developed dengue.In compassion, 24% of 76 persons from Area A who worked at any floor developed dengue (RR=0, 95% CI: 0-0.41).However, all workers who worked at Area A lived in the same two dormitories.The Breteau Index was 30 in Area A, higher than the threshold level for dengue transmission (≥20).In Area B, the Breteau Index was 0.Conclusions: This dengue outbreak was related to poor environmental hygiene in Area A.We recommended that the construction site should eliminate the potential mosquito breeding sites.