HHS Secretary Robert F. Kennedy Jr. canceled $500 million in mRNA vaccine research grants, citing 400 research papers. However, most papers cited unrelated issues, while others used inappropriate methods (e.g., injecting mice intravenously). Experts strongly criticized the decision, highlighting the vaccines' proven safety and efficacy, including millions of lives saved. The decision is viewed as a dangerous blow to public health and scientific progress, potentially ceding mRNA technology leadership to other countries. Kennedy's department did not respond to requests for comment.

Prepared by Olivia Bennett and reviewed by editorial team.