Vector densities that potentiate Dengue outbreaks in a Brazilian city

被引:102
作者
Pontes, RJS
Freeman, J
Oliveira-Lima, JW
Hodgson, JC
Spielman, A
机构
[1] Harvard Univ, Sch Publ Hlth, Dept Immunol & Infect Dis, Boston, MA 02115 USA
[2] Univ Fed Ceara, Dept Saude Comunitaria, BR-60431970 Fortaleza, Ceara, Brazil
[3] Fundacao Nacl Saude Ceara, BR-60150160 Fortaleza, Ceara, Brazil
关键词
D O I
10.4269/ajtmh.2000.62.378
中图分类号
R1 [预防医学、卫生学];
学科分类号
1004 ; 120402 ;
摘要
To identify the critical vector density that potentiates dengue outbreaks in an endemic site and to identify obstacles to anti-dengue activities, we correlated a series of dengue outbreaks in a Brazilian city with the intensity of its anti-vector source-reduction activities. The proportion of houses infested by vector mosquitoes correlated inversely with intensity of anti-mosquito interventions, and the vector population developed independently of rainfall. Local periods of drought promoted vector abundance in two ways: residents stored water in which vector mosquitoes could breed, and cholera outbreaks due to contaminated water diverted local health workers from routine anti-vector activities. One dengue outbreak became apparent to authorities more than two months after it commenced but would have been identified almost immediately had dengue-like disease in indicator hospitals been monitored. Active surveillance, therefore, offers a window of opportunity for promptly executed anti-dengue interventions. Source-reduction measures that suppress vector infestations to less than 1% of houses effectively avert outbreaks of dengue.
引用
收藏
页码:378 / 383
页数:6
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