China’s CanSino Biologics Inc has said that no serious blood clot cases have been reported in people inoculated with its single-dose Covid-19 vaccine, Reuters reports.

US federal health agencies recommended on Tuesday that use of a similar one-shot vaccine from Johnson & Johnson be paused after six women developed rare blood clots.

CanSinoBIO’s Ad5-nCoV vaccine is approved in China, Hungary, Chile and Pakistan.

Covid-19 vaccines from J&J, AstraZeneca, CanSinoBIO and Russia’s Gamaleya Institute uses an adenovirus, a harmless cold virus, as a vector to deliver instructions for human cells to produce part of the coronavirus that can spur the immune system to recognise and attack the actual virus.