Steve Parsons/Pool Photo via AP
Denmark on Wednesday became the first country to stop using AstraZeneca s COVID-19 vaccine.
Other shots are available, and older people have been immunized already, the health authority said.
Denmark did not rule out reintroducing the vaccine if the situation changes.
Denmark has stopped using AstraZeneca-Oxford University s COVID-19 vaccine, becoming the first country to stop using the shot entirely, but it did not rule out using it again later.
There is a real risk of severe side effects associated with using the COVID-19 vaccine from AstraZeneca, the Danish Health Authority said in a statement on Wednesday.
The benchmark for a vaccine worth using is 50%.
The trial of Sinovac s CoronaVac vaccine tested the shot in more than 12,000 health workers.
The COVID-19 vaccine from Chinese biotech Sinovac is about 50% effective at preventing symptomatic coronavirus, a late-stage trial in Brazil showed.
The two-dose CoronaVac vaccine was safe and 50.7% effective against symptomatic COVID-19, Sinovac s Brazilian partner, Butantan, said in a preprint posted Sunday, confirming top-line results announced by the group in a press release in January.
The World Health Organization (WHO) said April 2020 that a vaccine that was 50% effective in trials was worth using.
Butantan said that efficacy to prevent any symptomatic COVID-19 started at 50.7% and became more extensive as disease severity increased. The study authors found CoronaVac was 100% effective against severe COVID-19, but the number of cases was too small for them to be confident in the figure.