With some 100 million Americans fully vaccinated, the U.S. is relying on a patchwork network of vaccine monitoring systems that lack the breadth and depth of large, population-based programs, experts said.
from WebMD Health https://www.webmd.com/vaccines/covid-19-vaccine/news/20210503/detecting-rare-blood-clots-was-a-win-but-us-vaccine-safety-system-still-has-gaps?src=RSS_PUBLIC
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