CDC Meeting Discusses Vaccines and Safety Concerns
This past Thursday and Friday, the CDC convened its Advisory Committee on Immunization Practices (ACIP). It’s a significant group that guides the CDC director on vaccine recommendations for the public.
Ultimately, the committee decided to delay its most contentious vote, while also issuing recommendations that appeared to stir some doubts about Covid-19 vaccines, yet still allowed for their wide availability. During the discussions, some presenters and panelists voiced concerns regarding the mRNA Covid vaccines, specifically those developed by Moderna and Pfizer/BioNTech, suggesting potential unverified safety issues.
Retsef Levi, chair of the ACIP working group on Covid vaccines, highlighted issues about the persistence and distribution of mRNA, the nanoparticles encapsulating it, and the spike protein produced by the vaccines. He suggested that these elements might provoke a misunderstood immune response and possibly alter how the body interprets its genetic material. However, both Moderna and Pfizer countered that these assertions contradicted well-regarded studies that complied with global regulatory standards.
STAT published an interview with Drew Weissman, a professor at the University of Pennsylvania and a Nobel Prize laureate. The edited discussion touched on the ongoing discourse about the distribution of mRNA in the body.
Weissman noted that while there are papers out there making bizarre claims—like the Earth being flat—there are also countless other studies that effectively refute those claims. It’s a matter of finding reliable, empirical studies.
He further explained that although some research suggests that spike protein might linger in the body for extended periods, it’s important to evaluate the quality of the assays used in these studies. He indicated that many accurate experiments have not found circulating spike protein, explaining that the RNA typically degrades quickly and does not travel to various organs.
When questioned about whether mRNA might persist in rare cases, he firmly stated it is “absolutely impossible” for mRNA to continue producing spike protein for months. He stressed that any distortions stem from poorly constructed assays.
Another issue raised by Levi involved immune responses that may not be fully grasped. Weissman acknowledged some variability in responses among individuals, yet insisted that serious adverse reactions are exceedingly rare.
The committee also discussed concerns about DNA contamination in vaccines. Weissman clarified that minimal DNA impurities are common across many vaccines, but noted no associated adverse events have been documented historically.
In closing, Weissman expressed his distress over ACIP’s recent decisions, including the rejection of combined childhood vaccines and limitations on Covid-19 vaccines for broader populations. He reflected on historical vaccination successes, noting that vaccines have significantly reduced childhood mortality rates over the years. He advocated that vaccines, including the mRNA versions, have been thoroughly tested and generally exhibit high safety profiles, attributing millions of lives saved to their effectiveness in curbing the pandemic.
