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Why do you think there are no longer polio cases in the US, but there are some cases of influenza?
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- The first pandemic since 1968, which struck in 2009, turned out to be H1N1, a milder strain of which of the following? A. Swine flu B. Bird flu C. Ebola virus D. HIVEbola was a new plague of the 20th century that had a high mortality rate. What is Ebola, what are its origins and how did it manage to spread to Europe and America, especially New York?Why is Zika virus disease considered dangerous even though itrarely kills?