Covid vaccine study the acting CDC director blocked is published in an outside journal (opens original article in a new tab)

A CDC study on Covid vaccines, initially blocked by the acting director, was published in a peer-reviewed journal, showing vaccines reduced severe illness by about half. The study used a test-negative design, which the director questioned but some experts support as practical.

• A study on Covid vaccines that was blocked by the CDC's acting director was published in JAMA Network Open.
• The study found that vaccines reduced severe illness by about half, using a test-negative design comparing vaccinated and unvaccinated patients.
• The acting director raised concerns about the study's methodology, while some experts called the approach practical and efficient.