A Delta-specific version of COVID-19 vaccine has been developed months ago. Those who need a booster shot could have received it now. However, the FDA/CDC/NIH blocked its clinical trials and silenc…
"With an endemic virus, it might not be surprising that we need a booster shot every year," Rossi said.
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"Immune systems do what they do, they're great at it in the short term, but immunity does diminish with time, and especially with the emergence of more transmissible and potentially more deadly variants."