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County-level distribution of PfAPI, computed by autochthonous falciparum cases only, in Yunnan and Hainan Provinces during 2004–05. Counties were classified into three categories according to the falciparum malaria risk: stable (dark-red areas, where PfAPI ≥ 0.1 per thousand pa), unstable (pink areas, where PfAPI < 0.1 per thousand pa), or no risk (light grey).
