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The two methods for measuring the haemagglutinin content of an influenza virus suspension are the haemagglutinating (HA) and chick cell agglutinating (CCA) techniques and both measure the same biological activity. With the establishment of an international reference preparation for influenza virus haemagglutinin (type A), however, it seems logical to express the haemagglutinin content of influenza vaccines in international units. Accordingly a collaborative study was arranged in order to obtain agreement on the number of units to be assigned to a British reference preparation for influenza haemagglutinin. It was agreed that the preparation contains 190 i.u. per ampoule and 1 i.u. is contained in 0.0622 mg. of the dried material.
M Westwood, and
P M Woodward, and
F T Perkins
January 1971,
Bulletin of the World Health Organization,
M Westwood, and
P M Woodward, and
F T Perkins
August 1977,
FEBS letters,
M Westwood, and
P M Woodward, and
F T Perkins
December 1979,
FEBS letters,
M Westwood, and
P M Woodward, and
F T Perkins
January 1978,
Acta virologica,
M Westwood, and
P M Woodward, and
F T Perkins
January 1979,
British medical bulletin,
M Westwood, and
P M Woodward, and
F T Perkins
March 1968,
Acta virologica,
M Westwood, and
P M Woodward, and
F T Perkins
June 1989,
Philosophical transactions of the Royal Society of London. Series B, Biological sciences,
M Westwood, and
P M Woodward, and
F T Perkins
June 1976,
Postgraduate medical journal,
M Westwood, and
P M Woodward, and
F T Perkins
January 1982,
Archives of virology,
M Westwood, and
P M Woodward, and
F T Perkins
September 1985,
Vaccine,
