Dozens of Americans are rolling up their sleeves for a third dose of COVID-19 vaccine — this time, shots tweaked to guard against a worrisome mutated version of the virus.
from https://www.reviewjournal.com/news/nation-and-world/volunteers-getting-tweaked-vaccines-to-test-on-covid-mutants-2327350/
from
https://calliduselctric.tumblr.com/post/648278967437148160
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