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Current Trends Influenza Activity -- Northern Hemisphere, 1984

Trinidad: Outbreaks of influenza-like illness have occurred in Trinidad since early September. Persons of all ages have been affected, many of whom experienced gastrointestinal symptoms along with fever, cough, coryza, and myalgias. Twenty influenza type B viruses have been recovered from throat swabs collected in September and October from symptomatic children and adults, including one child hospitalized with neurologic symptoms consistent with encephalitis; no type A viruses were recovered. Antigenic analysis of the 20 isolates is currently in progress.

Japan: Influenza-like illness has occurred in northern Japan since mid-October. Influenza type B viruses were recovered from seven children who became ill sporadicallly and from two others who became ill during an outbreak that affected 105 (28%) of 380 children in one school.

Great Britain: Influenza viruses were isolated from sporadic cases occurring in August and September. In Newcastle, type A(H1N1) virus was obtained from an infant with leukemia in remission who became ill August 15. In Edinburgh, type B virus was obtained from a child who developed influenza in September after being hospitalized for several weeks.

United States: Influenza type B virus was isolated from specimens obtained from a 30-year-old woman in Houston, Texas, on October 24. The woman became ill with influenza on October 22 while returning from a trip that included stops in Hong Kong, Singapore, and Thailand.

Influenza A viruses recovered from two patients in Nevada (1) were recently submitted to CDC for reference analysis. Both viruses were closely related to A/Philippines/2/82(H3N2), a strain included in the current vaccine. Reported by P Diggory, MD, B Hull, Caribbean Epidemiology Centre, Trinidad; M Pereira, PhD, Central Public Health Laboratory, London, England; H Six, PhD, WP Glezen, MD, School of Medicine, Baylor University, Houston, CE Alexander, MD, State Epidemiologist, Texas Dept of Health; Virus Diseases Unit, World Health Organization, Geneva; Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC.

Editorial Note

Editorial Note: These early reports of influenza in the Northern Hemisphere are consistent with previous reports from the Southern Hemisphere and the tropics (2) and indicate that influenza A(H3N2), A(H1N1), and influenza B viruses continue to circulate in the world. Viruses related to the prevalent strains of influenza are included in this year's influenza vaccine, which should continue to be provided to persons who are at high risk or in priority groups (3).


  1. CDC. Influenza activity--Nevada. MMWR 1984;33:629-30.

  2. CDC. Influenza--Southern Hemisphere, Asia, the Tropics, 1984. MMWR 1984;33:515-6.

  3. ACIP. Prevention and control of influenza. MMWR 1984;33:253-60, 265-6.

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