As Covid-19 vaccines make it into more and more people's arms, you may be hearing that the second dose can be a little rough. But, while it may be unpleasant, these intense side-effects are actually a sign that the vaccines are working. And there may be even more good news when it comes to people who've already had COVID-19 getting the vaccine.

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Why Your Second COVID Shot Might Be a Doozy
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Sources:
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https://theconversation.com/vaccines-...
https://doi.org/10.1001/jama.2021.1375
https://www.ncbi.nlm.nih.gov/books/NB...
https://www.cdc.gov/vaccines/covid-19...
https://www.fda.gov/media/144245/down...
https://www.fda.gov/media/144452/down...
https://www.fda.gov/media/107553/down...
https://doi.org/10.1101/2021.01.29.21...
https://doi.org/10.1101/2021.01.30.21...
https://www.nytimes.com/interactive/2...