COVID-19 Study: Vaccine Halted Over ‘Adverse Reaction’

COVID-19 study vaccine

Getty Cells containing the novel coronavirus SARS-CoV-2 are seen through a microscope at the Stabilitech laboratory in Burgess Hill south east England, on May 15, 2020 where scientists are trying to develop an oral vaccine for the COVID-19 illness.

Trials for a potential coronavirus vaccine, which is being tested at dozens of U.S. sites, have been put on pause after a participant developed an adverse reaction,  STAT News said.

AstraZeneca, in partnership with the University of Oxford, has halted its Phase 3 trials of a vaccine after a “standard review process” found a “potentially unexplained illness in one of the trials,” according to a statement obtained by the outlet on September 8.

The participant is located in the United Kingdom, STAT indicated.

AstraZeneca initiated its Phase 3 trial in the United States on August 31, according to an online news release.

Although AstraZeneca did not disclose any details surrounding the participant or their adverse reaction, it indicated that it is “working to expedite the review of the single event to minimize any potential impact on the trial timeline,” according to STAT News.

It also emphasized that the pause was initiated by the company, the outlet continued.

STAT reported that the participant is expected to recover, citing “an individual familiar with the matter.”

While a total of nine potential vaccines are in Phase 3 Trials, AstraZeneca’s is the first to one to have been put on pause, the outlet added.

Here’s what you need to know about AstraZeneca’s potential vaccine:

Last Month, AstraZeneca Began Recruiting 30,000 People in the U.S.

According to The Los Angeles Times, AstraZeneca began recruiting in 30,000 Americans last month “for its largest study of the vaccine.”

AstraZeneca announced in an August 31 news release that it was aiming to enroll up to 30,000 adults over 18 “to assess safety, efficacy and immunogenicity of AZD1222 for the prevention of COVID-19.”

AstraZeneca Vice President Mene Pangalos said in the online release:

“We are pleased that AZD1222 demonstrated safety and immunogenicity across all adult age groups and are proud to be collaborating with BARDA and NIAID to accelerate the development of this vaccine. Should clinical trials demonstrate the vaccine protects against COVID-19 disease and is approved for use, we will work hard to make it globally available in a fair and equitable manner as rapidly as possible.”

The release indicated that participants will randomly receive either two doses of the vaccine or two doses of a saline control, four weeks apart. The trial will then determine the efficacy of the vaccine, as well as its safety, the release continued.

STAT added that the U.S. trial is being dispersed throughout 62 sites across the nation.

The U.S. trial is also being funded by the Biomedical Advanced Development Authority and the National Institute of Allergy and Infectious Diseases, the company announced online.

Many Have Taken to Social Media to Demand More Answers

Social Media


Since news of the hold broke on September 8, many have taken to social media to demand more answers surrounding the pause and adverse reaction.

As of early Wednesday morning, AstraZeneca was trending on Twitter with many calling on the company to dispel certain rumors circulating online.

Below are some of the responses:

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