| epidemiology and cost of infection with human parainfluenza virus types 1 and 2 in young children. | to determine the morbidity, costs, and epidemiological features of lower respiratory tract infections (lris) due to human parainfluenza virus types 1 and 2 (hpiv-1 and hpiv-2), we evaluated 1,213 children < 6 years of age who were seen for lris in the emergency room of the children's hospital of wisconsin and/or were admitted to the hospital for lris during the fall quarter of 1991. the age, sex, race, and respiratory syndrome were recorded for each child; 158 patients (13%) had respiratory samp ... | 1994 | 8075269 |