The hemagglutination assay (or haemagglutination assay; HA) is a method of quantification for viruses or bacteria by hemagglutination. It is an easy, simple and rapid method which can be applied to large numbers of samples.
The hemagglutination assay of a virus, in contrast to other forms of virus quantification such as a plaque assay or 50% Tissue Culture Infective Dose, does not give any measure of viral infectivity, because no virus replication is required in this assay. The same may not be true when using HA for bacteria.
Read more about Hemagglutination Assay: Mechanism, Procedure, Hemagglutination Inhibition Assay
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