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Sera taken from persons of various ages in 1951 and collected from adults yearly from 1943 to 1951, inclusive, were tested by the haemagglutination-inhibition method with influenza viruses selected to represent the subgroups of each antigenic type. These were influenza A-WS (1933) and PR8 (1934); influenza A-prime-FM1 (1947) and FW-1-50 (1950); influenza(More)