Hey there - It’s Hanna from the science team at First Day.
I’m reaching out to share an important update about a new flu virus.
A mutated strain of H3N2 is spreading earlier, faster, and harder than anything we’ve seen in years. Some scientists even think this could be the worst flu season in a decade. [1]
Here’s the quick version:
- The virus mutated seven times this summer (way before flu season).
- Those changes help it evade the immunity we’ve built over time.
- Cases started five weeks early in the UK and Japan.
- And H3N2 is a stronger strain, especially for older adults and kids with more fragile immune systems.
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To safer, more restful nights,
Hanna,
Scientific & Research Team
www.firstday.com
[1] “New flu virus mutation could see ‘worst season in a decade’,” BBC News, 9 November 2025.