Mathematics, 12.01.2021 21:40 PONBallfordM89

Which of the following statements is true? Before Jenner's vaccine, there was no prevention for smallpox.
Edward Jenner developed the first vaccine for cowpox.
Vaccination is only necessary for children under 5 years old.
Missed vaccinations can be given during "catch-up" periods.

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Which of the following statements is true? Before Jenner's vaccine, there was no prevention for sma...