Map of P. falciparum infections imported between countries in the Amazon basin, 2015–18. Number of P. falciparum mono and mixed infections imported by country/state of diagnosis and putative country of infection. Each country/state is represented by a standardized location not linked with the putative contamination place. Lines in the map represent the cumulative numbers of infections recorded during the 2015–18 period. Lines between countries include bidirectional data, while lines from countries to Brazilian states are unidirectional (imported in Brazil). The width and colour of the lines are proportional to the number of imported cases. The grey P. falciparum transmission layer is based on the Annual Falciparum Incidence (AFI) reported during the 2015–18 period. Unstable corresponds to AFI <1 for ≥1 year and endemic (stable) corresponds to AFI >1 for all years. Countries: BOL, Bolivia; COL, Colombia; ECU, Ecuador; GUF, French Guiana; GUY, Guyana; PER, Peru; SUR, Suriname; and VEN, Venezuela. Brazilian states: AC, Acre; AM, Amazonas; AP, Amapá; BA, Bahia; CE, Ceará; GO, Goiás; MA, Maranhão; MG, Minas Gerais; MT, Mato Grosso; PA, Pará; PI, Piauí; PE, Pernambuco; RO, Rondônia; RR, Roraima; and TO, Tocantins.