Abstract
Summary
The hemagglutinin (HA) of rubella virus can be released from serum inhibitor by binding divalent cations with EDTA. The HA is associated with the viral particle. HA can also be obtained by Tween-ether treatment of infected tissue culture fluids, in which case it is released from the intact whole virus. The attachment between red cells and HA is dependent on divalent cations, and removal of the latter from the environment of agglutinated red cells results in elution of HA.
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