Neighbor-joining tree depicting the four serotypes of dengue virus.

<p>Dengue virus in mosquitoes collected in Dar es Salaam (indicated in bold) clustered into serotype 2. The percentage of replicate trees in which the associated taxa clustered together in the bootstrap test (1000 replicates) is shown adjacent to the nodes.</p

Study districts and sites in Dar es Salaam.

<p>Study districts and sites in Dar es Salaam.</p