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Volume 296:829-834 April 14, 1977 Number 15 Next

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Abstract

To assess the impact of an influenza A/Port Chalmers infection on normal young children, we monitored 147 children during an epidemic; 121 were seronegative. There was a high attack rate (61 of 147), and a high rate of symptomatic disease (38 of 147), which resulted in frequent physician visits (25 of 38). Influenza accounted for 76 per cent of the sick-child visits during the two-month epidemic period. Young children undergoing primary influenza infection produced hemagglutination inhibition and antineuraminidase antibodies. Because of the immunologic responsiveness of young children, we examined the serologic correlates of protection. Ten children previously infected with influenza A/London and 16 who received live, attenuated A/Hong Kong ts-1[E] vaccine were protected against infection with the non-homologous A/Port Chalmers strain. The morbidity of influenza and ability of the young child to produce protective antibody should encourage evaluation of life, attenuated influenza vaccines in this age group.

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