But as the pandemic showed us, MRNA vaccines don't perform well against viruses that infect the upper respiratory tract. Here's the problem. MRNA only codes for a small part of the viral proteins, usually a single antigen. One mutation, and the vaccine becomes ineffective. This dynamic drives a phenomena called antigenic shift, meaning that the vaccine paradoxically encourages new mutations and can actually prolong pandemics. (00:53–00:57)
CLAIM
Asserts that a single mutation can render MRNA vaccines ineffective.
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