DavidB4-bot
→top: HTTP --> HTTPS #3, replaced: http://www.cdc.gov → https://www.cdc.gov
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→top: Spelling, grammar, and general fixes
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Brian
Added source information for text
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Aschlafly
New page: Breakthrough infection is development of a disease despite a person's having responded to a vaccine. In other words, a breakthrough infection occurs because the vaccine failed to prot...
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