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→top: HTTP --> HTTPS #3, replaced: http://www.cdc.gov → https://www.cdc.gov
'''Booster shots''' are additional doses of a [[vaccine]] needed periodically to "boost" the [[immune system]].
'''Booster shots''' are additional doses of a [[vaccine]] needed periodically to "boost" the [[immune system]].
For example, the [[tetanus]] and [[diphtheria]] (Td) vaccine require booster shots which are recommended for adults every ten years.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#b</ref>
For example, the [[tetanus]] and [[diphtheria]] (Td) vaccine require booster shots which are recommended for adults every ten years.<ref>https://www.cdc.gov/vaccines/about/terms/glossary.htm#b</ref>
==References==
==References==