AstraZeneca Plc, the drugmaker working with the University of Oxford on a Covid-19 vaccine, contradicted a report that a volunteer in UK tests of the shot developed a rare nerve disease that might have signalled severe safety problems.

AstraZeneca was responding on Thursday to a CNN report citing documents indicating that the diagnosis of the participant was confirmed as transverse myelitis. The diagnosis was based on preliminary findings, and is inaccurate, the Cambridge, England-based drugmaker said in an emailed statement.

Transverse myelitis has been linked to both vaccines and viral infections, and the Astra vaccine contains a virus that’s been altered to prevent it from growing in people. A diagnosis soon after vaccination raises the possibility that the virus used in the vaccine or some other component somehow triggered the rare reaction.

Also read: AZ-Oxford trials on Covid vaccine to resume in India

A CNN spokeswoman said the network stood by its story, which cites an initial report on the volunteer’s neurological condition.

It’s the first time AstraZeneca has specifically ruled out such a diagnosis. Chief Executive Officer Pascal Soriot has said it was unclear whether the trial participant had the condition. A document posted online by Oxford later said the person’s symptoms included limb weakness or changed sensation and were unlikely to be linked to the shot.

Also read: Covid-19: AstraZeneca faces questions over spinal ailment in vaccine-trial participant

“We are unable to comment further on this individual case because of international norms governing the integrity of clinical trials and protection for the privacy of individuals,” the company said on Thursday.

Astra’s US-traded depositary receipts rose 1.3 per cent in New York.

Timeline clouded

Questions continue to surround the participant’s illness, which has sparked concerns about vaccine safety and increased worries about when the first shots against the coronavirus could be ready. President Donald Trump said on Wednesday that Covid-19 vaccines may be widely available as early as October, running counter to administration officials and companies whose estimates of the timelines are months longer.

Trials of the Oxford-Astra vaccine resumed in the UK over the weekend, after a pause to investigate the adverse event, while researchers in South Africa also restarted tests. But a big US trial of the vaccine is still on hold. AstraZeneca is talking with the US Food and Drug Administration, which is reviewing information related to the episode and will decide when the US trial of the vaccine can resume, according to the statement.

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