The strange reason flu shots have been so hard to improve

5 verified updates • corroborated by 2 independent sources • tracked since August 8, 2026

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Aug 08, 07:30 AM 1 source: Newsday
The new mRNA flu shot mFlusiva is more effective. Why doctors worry Long Islanders may not get it.
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Aug 08, 12:00 PM 1 source: Newsday
The new mRNA flu shot mFlusiva is more effective. Why doctors worry Long Islanders may not try it.
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Aug 08, 02:00 PM 1 source: vox.com
The strange reason flu shots have been so hard to improve
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Aug 09, 07:00 AM 1 source: Newsday
The new mRNA flu shot mFlusiva is more effective. Why doctors worry Long Islanders may not try it.
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Aug 09, 08:00 AM 1 source: vox.com
The strange reason flu shots have been so hard to improve