TY - JOUR AU - Henrickson, K J TI - Monoclonal antibodies to human parainfluenza virus type 1 detect major antigenic changes in clinical isolates JO - J Infect Dis IS - 6 VL - 164 PY - 1991 DO - 10.1093/infdis/164.6.1128 SP - 1128 EP - 1134 ER -