The H1N1 swine flu pandemic of 2009-2010 resulted in the immunization of millions of people. When the immunizations were first available, people under the age of 25 or over 65 were given priority. This was done because H1N1
A) was a hazard to people in these age groups, and only these people were vulnerable to infection.
B) was most problematic for these age groups, who were most vulnerable to the hazard and thus at the greatest risk.
C) was not a hazard to these people, but they were most vulnerable to infection.
D) vaccines worked only on people in these age groups.
B
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