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1. LABORATORY-BASED SURVEILLANCE OF INFLUENZA VIRUS IN THE UNITED STATES DURING THE WINTER OF 1977–1978

Author

Gary R. Noble, M. R. Ross, Donald B. Nelson, Walter R. Dowdle, D. F. Woodall, G. Kobayashi, J. M. Joseph, J. L. Sarandria, R. White, Alan P. Kendal, and C. R. Reyes

Subjects
Veterinary medicine, Isolation (health care), Epidemiology, viruses, Influenzavirus B, Orthomyxoviridae, virus diseases, Outbreak, Hemagglutinin (influenza), Biology, medicine.disease_cause, biology.organism_classification, Virology, Virus, respiratory tract diseases, Genetic variation, Influenza A virus, medicine, biology.protein
Abstract

Influenza A (H3N2) viruses were isolated from outbreaks and epidemics of disease during the period December 1977 to March 1978. For the last two months of this period, H1N1 strains of influenza A were also responsible for epidemics. In some regions (e.g., Hawaii) co-circulation of H1N1 AND H3N2 strains occurred, whereas in other regions (e.g., Wisconsin) isolation of H3N2 strains had almost ceased prior to isolation of H1N1 strains. Few influenza B isolates were reported. Analysis of the ages of patients from whom specimens were submitted for influenza virus isolation confirmed that, whereas H3N2 strains were isolated from persons of all ages, greater than 97 per cent of H1N1 isolates in six states analyzed were recovered from patients less than 26 years old, although specimens were tested from older persons who were ill during the period of prevalence of H1N1 influenza. The majority of H3N2 isolates tested by hemagglutinin-inhibition reaction were similar to A/Texas/1/77, and the majority of H1N1 isolates were similar to A/USSR/90/77. Antigenic analysis of isolates, however, identified a small number of variants of H3N2 and H1N1 strains.

Published
1979
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2. Laboratory-based surveillance of influenza virus in the United States during the winter of 1977-1978. I. Periods of prevalence of H1N1 and H3N2 influenza A strains, their relative rates of isolation in different age groups, and detection of antigenic variants

Author

A P, Kendal, J M, Joseph, G, Kobayashi, D, Nelson, C R, Reyes, M R, Ross, J L, Sarandria, R, White, D F, Woodall, G R, Noble, and W R, Dowdle

Subjects
Adult, Adolescent, Influenza A Virus, H3N2 Subtype, Age Factors, Genetic Variation, Middle Aged, Orthomyxoviridae, United States, Disease Outbreaks, Influenza A Virus, H1N1 Subtype, Influenza A virus, Child, Preschool, Influenza, Human, Humans, Child, Antigens, Viral, Aged
Abstract

Influenza A (H3N2) viruses were isolated from outbreaks and epidemics of disease during the period December 1977 to March 1978. For the last two months of this period, H1N1 strains of influenza A were also responsible for epidemics. In some regions (e.g., Hawaii) co-circulation of H1N1 AND H3N2 strains occurred, whereas in other regions (e.g., Wisconsin) isolation of H3N2 strains had almost ceased prior to isolation of H1N1 strains. Few influenza B isolates were reported. Analysis of the ages of patients from whom specimens were submitted for influenza virus isolation confirmed that, whereas H3N2 strains were isolated from persons of all ages, greater than 97 per cent of H1N1 isolates in six states analyzed were recovered from patients less than 26 years old, although specimens were tested from older persons who were ill during the period of prevalence of H1N1 influenza. The majority of H3N2 isolates tested by hemagglutinin-inhibition reaction were similar to A/Texas/1/77, and the majority of H1N1 isolates were similar to A/USSR/90/77. Antigenic analysis of isolates, however, identified a small number of variants of H3N2 and H1N1 strains.

Published
1979

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