The isolation of Myxovirus parainfluenza type 3 from cattle with pneumonia, in S. Paulo, Brazil, is reported. All the strains isolated appeared to be antigenically related to the bovine strain SF-4. It was possible to establish a certain degree of antigenic relationship between the human strain HA-1 and one of the bovine strains isolated.
Myxovirus parainfluenza 3; Cattle pneumonia; Bovine strain SF-4; Human strain HA-1