platinumsage
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Nice summary here of the various factors that influence people's reaction to a vaccine:
The how’s and what’s of vaccine reactogenicity - npj Vaccines
Reactogenicity represents the physical manifestation of the inflammatory response to vaccination, and can include injection-site pain, redness, swelling or induration at the injection site, as well as systemic symptoms, such as fever, myalgia, or headache. The experience of symptoms following...
www.nature.com