Johnson and Johnson has stopped its COVIDvaccine trial to investigate why one member in the study fell sick.
The organization said an independent review would check if the individual’s unexplained symptoms related to the jab.
It has suspended recruitment to the phase three trial as a precaution.
It said in large trials, with tens of thousands of volunteers, it was to be expected that some may become unwell during the study period.
The organization said that for privacy reasons, it couldn’t give more details about the participant.
“We’re likewise learning more about this participant’s illness, and it’s important to have all the facts before we share extra information,” it said in a statement.
It isn’t the first COVIDvaccine trial to be suspended – a participant in the UK’s Oxford University study had an unexplained illness as well, yet it has since been deemed safe to continue, except for in the US where regulators are still in discussions with manufacturer Astra Zeneca.
There are nearly 180 vaccine candidates being tested the world over, however none has yet finished clinical trials.
The Johnson and Johnson jab, similar to the Oxford University Astra Zeneca one, is in the advanced stage of testing.
Both use a modified common cold virus to prime the immune system against COVID. The Johnson and Johnson trial had started recruiting participants in late September, with a goal of enrolling up to 60,000 volunteers across in excess of 200 sites in the US just as in South America and South Africa.
This article is originally posted on BBC