Australia has reported its first fatality from blood clots in a recipient of AstraZeneca's Covid-19 shot, and its regulator said there was a likely link between the 48-year-old woman's death and the vaccine, Reuters reports.

Hers was the third instance of the rare blood clots appearing in people who have been administered the vaccine in Australia. The other two are recovering well, the Therapeutic Goods Administration (TGA) added.

In the absence of an alternative cause for the clot that she developed, Australia's Vaccine Safety Investigation Group "believed that a causative link to vaccination should be assumed at this time", the TGA said.