A Centers for Disease Control and Prevention official has delayed the release of a study examining the effectiveness of COVID-19 vaccines, citing concerns about the research methodology.

Dr. Jay Bhattacharya, a top CDC official in the Trump administration, objected to the study's approach, arguing that it provided an inaccurate representation of the vaccine's benefits. The specific methodological concerns that prompted the delay have not been publicly detailed.

According to sources familiar with the research, the study found that COVID-19 vaccinations reduced urgent care visits and hospitalizations by approximately 50% in healthy adults. The study examined real-world effectiveness data to assess how well the vaccines performed in preventing severe outcomes.

The delay comes as federal health agencies continue to evaluate and communicate the benefits and limitations of COVID-19 vaccines to the public. The CDC regularly conducts and publishes studies on vaccine effectiveness as part of its ongoing monitoring of public health interventions.

It remains unclear when the study might be released or whether revisions to address the methodological concerns will be made before publication. The CDC has not provided a timeline for resolving the issues raised by Dr. Bhattacharya.