NEUTRALIZATION OF INFLUENZA A VIRUS BY HUMAN SERUM.
A linear relationship exists between the quantity of human serum used and the quantity of influenza A virus neutralized. By means of this relationship it is possible to determine the maximum quantity of virus which a given human serum can neutralize. This quantity, the neutralizing capacity, is a fixed value and, unlike the serum dilution end point, is independent of the amount of virus used in the neutralization test.
Laboratories of the International Health Division of The Rockefeller Foundation, New York.
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