Why is It So Difficult to Create a Vaccine Against Influenza (711 words, 2 pages)
In the United States, several diseases including polio, yellow fever,and measles have been eradicated as a result of nationwide vaccination andvector control efforts. Once it was determined that mosquitos were thevectors spreading yellow fever, large-scale efforts to control mosquitopopulations were effective enough to virtually eradicate the disease in theUnited States. ...
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