Tehran University of Medical Sciences Acta Medica Iranica 0044-6025 0 1-2 1969 06 15 43 48 A. AFSHAR S. FATEMI 2015 09 28 199 human serum samples were examined for the presence of Myxovirus Parainfluenza 3 (MPI 3)haemagglutination inhibition (HI) antibodies. or tbe total male sera, 75% and female 70.52% had HI antibody titers of t:32 or greater. The percentage of positive samples increased according to the age grouping of the human beings. These results indicate that MPI 3 virus infection is widespread among the human population in Iran. and it may be considered as one of the causes of respiratory illnesses in children and adults. https://acta.tums.ac.ir/index.php/acta/article/view/4100 https://acta.tums.ac.ir/index.php/acta/article/download/4100/4075