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According to the United States Department of Health and Human Services, there are 2 types of influenza vaccines - trivalent and quadrivalent.
humanitarian aid to victims of World War II.
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The United States has the greatest number and variety of elections.
United states
According to the United States Center for Disease Control and Prevention, there are 4 types of Influenza viruses, but only three infect humans (A, B & C). Influenza D infects cattle and is not known to infect people.
Of the United States soldiers who died in Europe, half of them fell to the influenza virus and not to the enemy. An estimated 43,000 servicemen who were mobilized for WWI died of influenza.
According to the United States Center for Disease Control and Prevention, there are 4 types of Influenza viruses, but only three infect humans (A, B & C). Influenza D infects cattle and is not known to infect people.
The virus spread around the world and killed millions of people
The virus spread around the world and killed millions of people
The United States.