We reviewed the charts of 24 patients with malaria seen at the Queens Hospital Center, Jamaica, NY, over the past five years. Twenty-three patients were foreign citizens. Eighteen patients were infected with Plasmodium vivax and six with Plasmodium falciparum. Malaria was suspected on admission in 19 of the 23 hospitalized patients. Five patients were admitted with unrelated diagnoses, and four of these experienced diagnostic delay. All diagnoses were confirmed with thin blood smears. Twenty-one patients were febrile, and 18 patients had prominent gastrointestinal tract symptoms. Serum glucose level was increased in nine patients, and hypoglycemia occurred in one. Four patients also had intestinal parasites. Malaria should be suspected in travelers with gastrointestinal tract symptoms, and patients with malaria may have other parasitic infections. Most patients with P vivax infections can be treated as outpatients, since the course is usually uncomplicated.