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Johnson & Johnson to Seek F.D.A. Authorization for Booster Shot

WASHINGTON — Johnson & Johnson is planning to ask federal regulators early this week to authorize a booster shot of its coronavirus vaccine, according to officials familiar with the company’s plans. The firm is the last of the three federally authorized vaccine providers to call for extra injections, amid mounting evidence that at least the elderly and other high-risk groups need more protection.

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Studies indicate that the Coronavirus May Be Getting Better at Airborne Transmission

Newer variants of the coronavirus like Alpha and Delta are highly contagious, infecting far more people than the original virus. Two new studies offer a possible explanation: The virus is evolving to spread more efficiently through air.

The realization that the coronavirus is airborne indoors transformed efforts to contain the pandemic last year, igniting fiery debates about masks, social distancing and ventilation in public spaces.

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