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Prevention of Influenza
Individual protection against the flu may be bolstered by injection of a vaccine containing two or more circulating influenza viruses. These viruses are produced in chick embryos and rendered noninfective; standard commercial preparations ordinarily include the type B influenza virus and several of the A subtypes. Protection from one vaccination seldom lasts more than a year, and yearly vaccination may be recommended, particularly for those individuals who are unusually susceptible to influenza or whose weak condition could lead to serious complications in case of infection. Routine immunization in healthy people, however, is also recommended. In order to prevent human-infecting bird flu viruses from mutating into more dangerous subtypes, public health authorities try to limit the viral “reservoir” where antigenic shift may take place by ordering the destruction of infected poultry flocks.
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