[Differences of capacity of human erythrocytes of newborn infants and adults and trypsin-treated erythrocytes to bind rubella virus hemagglutinin].

Rubella virus hemagglutinating (HA) antigen shows different titers against non treated, trypsin-modified and cord blood human erythrocytes. Trypsin-modified erythrocytes give titers eleven fold higher, and cord blood red cells sixteen fold higher than those seen with the non treated cells. These differences in sensitivity agree with a different ability to bind HA antigen: with an excess of antigen cord blood erythrocytes bind two, and trypsin-modified erythrocytes three times as much antigen was bound by non treated cells. The amount of bound antigen shows little or no dependence on 4 degrees or 37 degrees C temperatures.