American Journal of Epidemiology Vol. 125, No. 4: 576-586
Copyright © 1987 by The Johns Hopkins University School of Hygiene and Public Health
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INFLUENZA B VIRUS REINFECTION
From the Influenza Research Center, Department of Microbiology and Immunology and Department of Pediatrics, Baylor College of Medicine Houston, TX 77030
Send reprint requests to Dr. Arthur L Frank, Department of Pediatrics (M/C 856), University of Illinois College of Medicine, 840 South Wood Street, Chicago, IL 80612
Four outbreaks of Influenza B Infection occurred in Houston, Texas in the years 19761984. In the Houston Family Study, age-related infection and illness rates in the recent two epidemics resembled those reported previously. A total of 118 persons, including 35 children followed from birth, were followed longitudinally through this entire period and 331 persons were studied through at least two outbreaks. Fifty-nine (88%) of 67 children studied for four outbreaks were infected and 25% had a second infection; about half of the adults had one infection but only one of 51 was reinfected. Infection rates were proportionally lower for those followed through 23 outbreaks. Those with documented infection were protected decreasingly over time against reinfection and associated illness in subsequent epidemics. Such protection decreased in efficacy from 65% after 23 years, to 46% after 45 years, and to no protection after seven years.
influenza; orthomyxovirus infections; virus diseases
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