MALARIA SURVEILLANCE—UNITED STATES, 1998 [MMWR 2001;50:SS-5]: This is a CDC review of malaria up through 1998 in the US with the following observations: Number of cases for 1998: 1,227 including military personnel (22), United States citizens (636), non United States citizens (361) and “unknown” (208). Species: P. falciparum (43%), P. vivax (38%), P. malariae (3.5%) and P. ovale (2.1%) Country of acquisition: Africa (60%), Asia (20%), America (19%). Time from arrival in the US to onset of symptoms (Table 3):TABLE 3: Time from arrival in the US to onset of symptomsCryptic malaria: Their review includes one case of malaria in a patient with no history of travel, a second case where the only travel was to the UK, and a third where the only travel was from 10 years previously. Malaria deaths: There were 4 deaths attributed to malaria for a mortality rate of 0.3%. Prophylaxis: Of the imported cases, 73% were in US citizens who were not taking malaria prophylaxis. Resources for information (Table 4):TABLE 4: Resources for information
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A 2002 study studied this question.