Dr. Fauci said the pause will give U.S. health regulators the time they need to thoroughly investigate how six women developed a rare blood clotting disorder.
The warning from U.S. officials to states is likely to fuel more hesitancy in taking J&J's shot and other vaccines, threatening to stall the pandemic recovery.
The risk of blood clots is higher from Covid than from J&J's vaccine, Dr. Purvi Parikh, who worked on other Covid vaccine trials, told CNBC on Tuesday.
Drugstores and grocers, who play a crucial role in the vaccine's administration, are now having to decide how to proceed after the FDA request on Tuesday.
The supply of the two-shot vaccines from Pfizer and Moderna won't be able to quickly make up the demand created by the J&J pause, Dr. Kavita Patel told CNBC.
The news comes a week after the formal announcement that leading man Rege-Jean Page would not return to reprise his role as Simon Basset, the Duke of Hastings.
Despite recent data showing a big drop in average prices from February, sales of NFTs at the start of the year showed an explosion of interest and buying.