The vaccine maker said it has updated the US Covid-19 vaccine fact sheet to warn about the risk of thrombosis with thrombocytopenia syndrome (TTS), a rare but potentially life-threatening condition.

Use of the J&J shot has been weak in high-income countries, hurt by reports of rare, potentially deadly blood clots, production issues, including an accidental mix-up of ingredients by a contract manufacturer, and concerns about efficacy.

The drugmaker last month rescinded its forecast for Covid-19 vaccine sales, citing a glut of supply.

Cases of TTS, which involves blood clots accompanied by a low level of platelets, have previously been reported in recipients of the J&J vaccine.

The FDA in January amended the fact sheet for the J&J vaccine to include the risk of immune thrombocytopenia, months after the European Union's drugs regulator took similar action.

The FDA on Thursday said the risk of TTS warranted limiting the use of the single-dose shot after it conducted investigation of reported cases.

The US Centers for Disease Control and Prevention in December had recommended that Americans choose to receive mRNA shots from Pfizer and Moderna over J&J's vaccine due to the rare cases of blood clotting.

Around 18.7 million Americans have received a J&J Covid-19 shot compared with 217.5 million people who received the Moderna vaccine and 340.6 million people who received Pfizer's shot, according to CDC.

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