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Johnson & Johnson reports that a booster shot of its COVID-19 vaccine is 94% effective against symptomatic cases when administered two months after the initial dose, and 100% effective against severe COVID-19 after 14 days. The booster, given after six months, significantly increases antibody levels. The company has submitted its data to the FDA. The US will ease travel restrictions for fully vaccinated international travelers starting in November, requiring proof of vaccination and a negative COVID-19 test within three days before flying. Unvaccinated Americans must test negative one day before boarding and again upon arrival. These measures aim to protect Americans and ensure safe international travel.

How long after vaccination was the Johnson and Johnson booster shot reported to be 100% effective against severe COVID?

What did a White House official say about the new travel rules?