Parasite incidence by district pre- and post-tsunami. Monthly parasite incidence of P. falciparum and P. vivax malaria combined in 2004 (red bars) and 2005 (blue bars). Overlapping bars color purple. Bars in the legend represent 1 case per 10,000 persons per month. Numbers indicate the percentage change of January – December 2005 as compared to January – December 2004 for each district.