Table 2. Number of DENV sequences used in this study.

Serotype	School surveillance	Index case initiating village cluster investigation*	Village contact of index case	Mosquito
DENV-1	38	25	24	10
DENV-2	12	6	2	3
DENV-3	1	1	1	2
DENV-4	34	15	18	1

^*All samples were obtained via school absence-based surveillance within a childhood cohort and village cluster studies activated by illness within the cohort in Kamphaeng Phet, Thailand from 2004–2007. Index cases were detected through school-based surveillance and subsequently selected for village cluster investigation. These are not included in school surveillance counts.