Serums collected on the day of inoculation and five weeks later were tested by the complement-fixation technic for evidence of rise in titer of antibody to parainfluenza virus Types 1, 2 and 3 ...

A respiratory tract infection caused by human parainfluenza viruses ... Mostly seen in The autumn HPIV 3-Mostly associated with pneumonia and bronchiolitis. Cause infections in the spring and ...