PMID: 25776595Mar 18, 2015Paper

Possible association between recent migration and hospitalisation for dengue in an urban population: a prospective case-control study in northern Vietnam

Tropical Biomedicine
Ataru TsuzukiNoboru Minakawa

Abstract

A prospective case-control study was conducted in urban districts in Hanoi, northern Vietnam to evaluate the effect of migration on the risk of hospitalisation for dengue in a Vietnamese urban population. We enrolled laboratory-confirmed dengue patients aged ≥ 18 years who were hospitalised in local hospitals in November and December 2010. Four neighbourhood-matched controls for each case were recruited within a week of hospitalisation. Sociodemographic data were collected by interviews, and the number of immature and adult mosquitoes within household premises was counted by entomological survey. Matched-pair analyses were conducted using conditional logistic regression models. Among 43 cases and 168 controls, 84% and 83% were migrants from rural areas, respectively. Although statistical significance was marginal, recent migration (residing in study area for ≤ 5 years) independently increased the risk of hospitalisation for dengue compared with inhabitants after controlling for potential confounders (adjusted odds ratio [aOR] = 3.78; 95% confidence interval [CI] = 0.99-14.27), whereas longer-term migration (residing in study area for ≥ 6 years) did not change the risk (aOR = 1.1; 95% CI = 0.30-4.05). Younger age (18-34 years) (...Continue Reading

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