A recent study conducted by the U. S. Centers for Disease Control and Prevention (CDC) has shed light on how long immunity lasts after receiving the Covid-19 vaccine. The study revealed that immunity against severe COVID-19 begins to decline four months after receiving the third booster dose of the Pfizer or Moderna vaccines.
The study was conducted to determine what it would take to vaccinate the world against COVID-19. Researchers analyzed the health records of 83,057 people and divided them into four categories based on the time between their second vaccination and their RT-PCR test. The categories were 30 days after the first 90 days, 90 days after the first 90 days, 120 days after the first 90 days, and 180 days or more from the second vaccination. The results of the study showed that immunity against severe COVID-19 begins to decline four months after receiving the third booster dose of either the Pfizer or Moderna vaccines. This means that people who have been vaccinated should be aware that their immunity may not last forever and should take precautions to protect themselves from infection.
It is important to note that this study only looked at immunity against severe COVID-19 and did not look at immunity against milder forms of the virus. It is also important to remember that this study only looked at people who had received two doses of either the Pfizer or Moderna vaccines and did not look at people who had received one dose of either vaccine. The findings of this study are important for understanding how long immunity lasts after receiving a Covid-19 vaccine and for helping to inform public health decisions about how best to protect people from infection. It is also important to remember that even if someone has been vaccinated, they should still take precautions to protect themselves from infection, such as wearing a mask, washing their hands regularly, and avoiding large gatherings.
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