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When Johnson & Johnson's COVID-19 vaccine was authorized for use in late February, public health officials emphasized that it was just as good as the others. It was less effective, but because it requires only a single shot for full protection and is easier to distribute, it was a top choice for many people.
Since then, the J&J vaccine has been given far less often than the other two authorized vaccines, accounting for one-tenth as many shots as Moderna's vaccine, which is given less often than Pfizer-BioNTech's.
Recently, three pieces of information have come to light making people who got the J&J vaccine wonder whether their shot might be a distant third in other ways, too.