COVID-19 vaccine study is finally published after CDC journal blocked it

Key Points:

• A study published in JAMA Network Open found COVID-19 vaccines to be about 55% effective against hospitalizations and reduced emergency and urgent care visits by 50%.
• The study, using a "test-negative design," was initially blocked from publication in the CDC's Morbidity and Mortality Weekly Report due to concerns raised by acting CDC Director Jay Bhattacharya about potential false assumptions.
• Public health experts defend the study's methodology as reliable and widely used for decades, emphasizing its importance in providing real-time vaccine effectiveness data amid evolving viral strains.
• The controversy highlights differing views within the scientific community, including critics like Bhattacharya and Martin Kulldorff, who question the study design and advocate for longer-term evaluations.
• The CDC recently held a forum discussing the methodology's strengths and weaknesses, reflecting ongoing debates about the best approaches to assess COVID-19 vaccine performance during the pandemic.