"The British Committee has completed its investigations and recommended to the MHRA that it is safe to resume testing in the UK," Astra Zeneca wrote in a press release.

Suspected side effect

Exactly what the participant suffered, the company has not revealed.

According to media reports, the person suffered from a nerve inflammation in the spinal cord, which could be a side effect of the vaccine.

- It is exactly this type of side effects that you are looking for.

Some vaccines have a rare side effect that is similar to this, said Sweden's vaccine coordinator Richard Bergström to Expressen when the stop became known.

Tests in four countries

The vaccine, known as AZD1222, was developed by Astra Zeneca in collaboration with researchers at Oxford.

Phase 3 tests are underway in the United Kingdom, the United States, Brazil and South Africa.

“Globally, approximately 18,000 individuals have received study vaccines as part of the tests.

In large studies such as this, it is expected that some participants become ill and each case must be carefully evaluated to assess safety ", Oxford University writes in a statement.