To the Editor.—
Since the beginning of the conflict in Southeast Asia during 1965, the incidence of malaria imported into the United States has increased significantly. The following report documents a case of Plasmodium malariae (quartan malaria) in a veteran who served in Vietnam during 1968 and 1969. A fever curve that is not classical for quartan malaria is notable. The period of time that had elapsed since the serviceman returned to this country was longer than other imported cases of P malariae during 1969.
Report of a Case.—
A 22-year-old man was admitted to the hospital during June 1971. He had returned from Vietnam in September 1969, where he had spent one year. During this tour of duty he took chloroquine (300 mg) weekly and primaquine phosphate (45 mg), plus dapsone prophylaxis intermittently, and did not continue a prophylactic regimen after leaving Southeast Asia. He had not left the