Denmark has ceased giving the Oxford-AstraZeneca Covid vaccine amid concerns about rare cases of blood clots, the first European country to do so fully.

The move is expected to delay the country's vaccination program by several weeks.

Drug watchdog the European Medicines Agency last week announced a possible link with clots but said the risk of dying of Covid-19 was much greater.

Several European countries had previously briefly suspended the jab.

Most have now resumed vaccinations with AstraZeneca, but often with limits to older age groups.

On Tuesday, the US, Canada, and the European Union paused the Johnson & Johnson vaccine for similar reasons over clotting.

South Africa has also paused its use, despite the Johnson & Johnson being its preferred vaccine because of its effectiveness against the South African variant.

For both AstraZeneca and Johnson & Johnson, the blood clot side effects are extremely rare.