Contamination Found in mRNA Vaccines

Contamination Found in mRNA Vaccines

In recent news, it has been discovered that the Pfizer and Moderna mRNA vaccines for COVID-19 have DNA contamination. This news was brought to light by microbiologist Dr. Kevin McKernan who found “unacceptable levels” of double-stranded DNA plasmids floating in these vaccines. It is essential to understand the gravity of this issue, and its potential consequences.

What are DNA plasmids, and what is their role in vaccines?

DNA plasmids are circular segments of DNA that can replicate independently of the chromosomes. In vaccines, these plasmids play a crucial role in the production of the spike protein that is found on the surface of the SARS-CoV-2 virus, the virus responsible for COVID-19. The spike protein is then recognized by our immune system, which in turn starts producing defenses against the virus. This is a crucial step in any vaccine production. However, when these plasmids contain DNA that is not supposed to be present in the vaccine, it raises significant concerns.

What does DNA contamination mean for the Pfizer and Moderna vaccines?

As mentioned earlier, the presence of DNA contamination in these vaccines is a significant cause of concern. DNA plasmids should only contain the necessary sequence to produce the spike protein. However, when they contain foreign DNA, or DNA fragments that are not supposed to be present, it could lead to more sinister effects. Dr. McKernan has pointed out that these vaccinated individuals could potentially develop undesirable immune responses to the foreign DNA, leading to severe allergic reactions and other side-effects. This is especially true for individuals who have a history of allergies or underlying medical conditions.

What are the possible consequences of DNA contamination in vaccines?

The potential consequences of DNA contamination of vaccines are quite severe. We are currently facing a pandemic that has already devastated the global population, and vaccines are our only hope. However, if the vaccines themselves become the cause of new health problems, it could have devastating consequences. First, allergic reactions could become more common, leading to higher rates of hospitalization and deaths. Second, the efficacy of the vaccines could potentially be compromised as the immune system attacks the foreign DNA instead of the SARS-CoV-2 spike protein. Third, the public may lose trust in vaccine manufacturers, leading to lower uptake of vaccines overall.

What is the response from the manufacturers?

Both Pfizer and Moderna have issued statements regarding the DNA contamination findings. Pfizer noted that “the presence of plasmid DNA sequences in the vaccine is expected” and that “such sequences are commonly used across various vaccine platforms.” They further noted that the FDA, EMA, and other regulatory bodies had reviewed and authorized the vaccine. Moderna echoed similar sentiments, stating that “the batch release specifications for the clinical trial material and all subsequent batches have been approved by the FDA.”


News of DNA contamination in the Pfizer and Moderna vaccines is concerning, to say the least. Given the gravity of the COVID-19 pandemic, we cannot afford to take any chances with our vaccines. It is essential that we continue monitoring the situation and work towards ensuring that all future vaccines are free from any contaminants. As a society, we need to place our trust in science and continue following all guidelines and recommendations from health experts to ensure that we can overcome this pandemic as soon as possible.