Table 1.

Effects of erythrocyte pretreatments with viral esterase on hemagglutination by influenza C/JJ/50 virus

TreatmentHA titera
6 wk old6 mo old
C/JJ/50b <2NDND
MHV-Sb 128256512
  • a Reciprocal of the highest virus dilution resulting in full agglutination. All experiments were performed three times. ND, not determined.

  • b Erythrocytes were preincubated with 30 mU of viral esterase for 3 h at 37°C.