Giovanni Cimatti

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Haemagglutination inhibiting antibodies (H.I.A.) to influenza viruses A/Victoria/3/75, A/Victoria/112/76, B/Hong Kong/8/73 and A/New Jersey/8/76 were titrated in 1110 serum specimens collected in Rome in the period between March-May 1977 and obtained from subjects 0-60 years old. The H.I.A. protective level (greater than or equal to 1 : 40) found in 21.7%(More)
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