The rise in the number of breakthrough infections has become a matter of great concern and urged experts to look for better possibilities. From mix and match of COVID vaccines to the development of a possible third COVID dose, scientists and researchers are looking into various means and methods to make vaccines more effective. That said, the US health agency has now recommended a third mRNA booster shot for people who have a compromised immunity. The announcement comes at a time when Delta variant cases are on the rise in the US.
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