Adverse reactions observed in AstraZeneca’s COVID-19 vaccine clinical trial may not have been caused by the vaccine itself, the researchers involved in the studies say.
AstraZeneca’s third-stage trials in the United States, Britain and South Africa were suspended earlier this month when one subject in Britain experienced an adverse reaction.
The drugmaker and partner Oxford University said in an update this week that “unexplained neurological symptoms” that were observed were either “considered unlikely to be associated with the vaccine” or there was “insufficient evidence to say for certain that the illnesses were or were not related to the vaccine.”
The researchers added that they will continue to closely monitor “affected individuals and other participants.”
The studies later resumed in Britain, but remain on hold in the United States.
