May 2025 โ Health officials have detected 14 cases of a new COVID subvariant, NB.1.8.1, in Washington state.
The earliest sample dates back to April 7, with the most recent found at Seattle-Tacoma International Airport on May 15.
๐ฌ Key Facts About NB.1.8.1

First appeared in the U.S. in March/April 2025.
๐น WHO classified it as a “variant under monitoring” due to the rising global spread.
๐น No evidence that it causes more severe illness than other strains.
๐น Current vaccines are still expected to protect against serious cases.
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๐ Where Were Cases Found?
๐น 13 detections from Sea-Tac Airport (via CDCโs traveler screening program).
๐น 1 case flagged by the U.S. Air Force School of Medicine.
๐น Unclear if all infected individuals were Washington residents or just passing through.
โ ๏ธ Should You Be Worried?
Vaccines are still effective against severe outcomes. | Reassurances |
---|---|
Rising global spread. | No signs of increased severity. |
Limited detection due to fewer tests. | Potential for a new wave if unchecked. |
Potential for new wave if unchecked. | WHO says public risk remains low. |
๐ฉบ Why Tracking is Harder Now
๐น Fewer official PCR tests (most people use at-home rapid tests).
๐น Less genomic sequencing compared to 2020-2023.
๐น Airport screenings are now a major detection source.
๐ก๏ธ How to Stay Protected
โ Get boosted if youโre due (especially high-risk groups).
โ Test if symptomaticโearly detection helps prevent spread.
โ Consider wearing masks in crowded places (airports, hospitals).
๐ Whatโs Next?
๐น Health officials will monitor for increased spread.
๐น If cases rise, the CDC may update vaccine recommendations.
“This is a developing story. Check back for updates on NB.1.8.1โs impact.”
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