J&J COVID-19 Vaccinations Resume After Temporary Shutdowns

Vaccinations with the Johnson & Johnson jab paused at several sites earlier this week after an unusual number of people experienced adverse reactions, but the CDC says there’s no cause for concern.

Written byShawna Williams
| 3 min read
Dicks Sporting Goods Park stadium from a distance with mountains in the background

Register for free to listen to this article
Listen with Speechify
0:00
3:00
Share

ABOVE: Dicks Sporting Goods Park near Denver, where mass vaccination with the Johnson & Johnson vaccine was paused on Wednesday after 11 people who received the shot felt unwell
© ISTOCK.COM, MILEHIGHTRAVELER

Three vaccination sites, one in Colorado and two in North Carolina, briefly paused administering the Johnson & Johnson vaccine against COVID-19 earlier this week after a small percentage of recipients experienced adverse reactions. The shots resumed after investigations by the US Centers for Disease Control and Prevention found the incidents were consistent with the vaccine’s known side effects.

On Wednesday afternoon (April 7), a mass vaccination clinic at a baseball stadium outside of Denver shut down after 11 people felt unwell within 15 minutes, according to The Denver Post. Their reactions included nausea, dizziness, and fainting; nine people were treated at the site with juice and water, while two were taken to the hospital. More than 1,700 people were ...

Interested in reading more?

Become a Member of

The Scientist Logo
Receive full access to more than 35 years of archives, as well as TS Digest, digital editions of The Scientist, feature stories, and much more!
Already a member? Login Here

Related Topics

Meet the Author

  • Shawna was an editor at The Scientist from 2017 through 2022. She holds a bachelor’s degree in biochemistry from Colorado College and a graduate certificate in science communication from the University of California, Santa Cruz. Previously, she worked as a freelance editor and writer, and in the communications offices of several academic research institutions. As news director, Shawna assigned and edited news, opinion, and in-depth feature articles for the website on all aspects of the life sciences. She is based in central Washington State, and is a member of the Northwest Science Writers Association and the National Association of Science Writers.

    View Full Profile
Share
February 2026

A Stubborn Gene, a Failed Experiment, and a New Path

When experiments refuse to cooperate, you try again and again. For Rafael Najmanovich, the setbacks ultimately pushed him in a new direction.

View this Issue
Human-Relevant In Vitro Models Enable Predictive Drug Discovery

Advancing Drug Discovery with Complex Human In Vitro Models

Stemcell Technologies
Redefining Immunology Through Advanced Technologies

Redefining Immunology Through Advanced Technologies

Ensuring Regulatory Compliance in AAV Manufacturing with Analytical Ultracentrifugation

Ensuring Regulatory Compliance in AAV Manufacturing with Analytical Ultracentrifugation

Beckman Coulter Logo
Conceptual multicolored vector image of cancer research, depicting various biomedical approaches to cancer therapy

Maximizing Cancer Research Model Systems

bioxcell

Products

Sino Biological Logo

Sino Biological Pioneers Life Sciences Innovation with High-Quality Bioreagents on Inside Business Today with Bill and Guiliana Rancic

Sino Biological Logo

Sino Biological Expands Research Reagent Portfolio to Support Global Nipah Virus Vaccine and Diagnostic Development

Beckman Coulter

Beckman Coulter Life Sciences Partners with Automata to Accelerate AI-Ready Laboratory Automation

Refeyn logo

Refeyn named in the Sunday Times 100 Tech list of the UK’s fastest-growing technology companies