Table 1. In-depth epidemiologic assessments in sentinel and extra-sentinel communities of the Southern Chiapas focus.

Surveys	1995	1998	2000	2001	2004	2006	2008	2010	2011
Ophthalmological	X		X		X	X	X
Parasitological	X	X	X		X	X	X
Entomological				X	X	X	X	X	X
Serological					X	X	X	X