A group of 110 patients (101 male, 9 female with mean age ± SD: 31,1 ± 11,0 years) with fever, coming from an endemic malaria region, was studied at SUCAM-CUIABÁ, for diagnosis and treatment of possible protozoal infection. For this group a simplified questionnaire on respiratory symptoms was applied and laboratory tests consisting of peripheral blood film, arterial blool gas analysis and pulmonary function test rwere done. 62 patients had a positive test of malaria (41 P. vivax, 20 P. falciparum 1 F + V) a¡rd 48 were negative, We conclude that there is an association between malarial infection and the presence of respiratory problems.