The US today recommended a "pause" in use of the single-dose Johnson & Johnson (J&J) COVID-19 vaccine to investigate reports of rare but potentially dangerous blood clots.
US health officials are looking into unusual clots in six women between the ages of 18 and 48, including one person who died.
We take a look at the important questions behind the J&J development, which has dealt another setback to the global vaccination campaign.
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