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Dec 30, 2021, 6:08 pm433 pts
Ars Technica
Enlarge (credit: RAJESH JANTILAL / GETTY IMAGES) Based on various measures, the Johnson & Johnson COVID-19 vaccine has appeared to be less effective than those based on mRNA technology. It has also been associated with some rare blood clotting complications that recently caused the CDC to revise its endorsement…
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