Russia is the most recent 1977-1978 flu epidemic of influenza caused by a strain of flu in A/USSR/90/77 (H1N1). The majority of infected children and young adults under 23 years due to stress is pervasive in the 1947 -- 57 The reason most adults are immune. Some called it a pandemic of influenza, but because Specifically related to youth are not considered a true pandemic. Virus was included in the 1978-1979 vaccine against influenza.
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