AstraZeneca Plc stopped giving shots of its experimental coronavirus vaccine after a person participating in one of the company's studies got sick, a potential adverse reaction that could delay or derail efforts to speed an immunization against Covid-19.
The pause stemmed from a standard review of the company's vaccine trials after one person developed an unexplained illness, AstraZeneca said in a statement. The move was intended to give researchers time to examine safety data while maintaining the integrity of the trials, the company said. The drugmaker's shares fell as much as 3% in London Wednesday morning.
The decision to tap the brakes jolted investors in AstraZeneca, which has a market value of about $140 billion and has the largest weighting of all the companies in the U.K.'s FTSE-100 Index.
Shares in Moderna Inc. and BioNTech SE, which are working on rival vaccines, gained in late trading in New York Tuesday.
"This is a routine action which has to happen whenever there is a potentially unexplained illness in one of the trials, while it is investigated, ensuring we maintain the integrity of the trials," AstraZeneca spokeswoman Michele Meixell said in a statement. She said that it's too early to determine the sick participant's specific diagnosis.
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