What is NB.1.8.1?
NB.1.8.1 is a new COVID-19 variant, a descendant of the Omicron sublineage, that is being monitored by the World Health Organization (WHO).
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Health / Infectious Diseases
New COVID Variant NB.1.8.1 Spreads Globally
A new COVID-19 variant, NB.1.8.1 (also known as "Nimbus"), is gaining traction worldwide, leading to increased monitoring by health organizations. First detected in January 2025, this Omicron sublineage is now present in the US, Europe, and...
Key Insights
- NB.1.8.1 is a descendant of the Omicron variant and has been detected in numerous countries, including the US, UK, China, and Australia.
- The WHO has designated NB.1.8.1 as a "variant under monitoring" due to mutations that may increase its transmissibility.
- Symptoms of NB.1.8.1 are similar to other Omicron subvariants, including fatigue, fever, sore throat, and muscle aches.
- Current COVID-19 vaccines are expected to remain effective against NB.1.8.1, protecting against severe illness.
- The variant may exhibit increased transmissibility, potentially leading to summer surges, particularly affecting vulnerable populations.
In-Depth Analysis
NB.1.8.1, informally known as "Nimbus," has specific mutations in its spike protein that could increase its infectiousness and allow it to evade certain antibodies. Data from GISAID shows that the first known cases were registered at the end of April 2025. The WHO's risk evaluation considers the additional public health risk posed by NB.1.8.1 as low at the global level, however it continues to monitor the situation closely.
While NB.1.8.1 appears to spread more easily than previous variants, the WHO has not observed any signs that it causes increased severity. Common symptoms align with typical Omicron subvariants and include fatigue, fever, muscle aches, and a sore throat. Current Covid jabs are expected to remain effective against this variant and protect anyone infected from severe illness.
Regional trends indicate notable increases reported in India, Hong Kong, Singapore and Thailand.
**How to Prepare:**
- Stay up to date with COVID-19 vaccinations and booster shots.
- Practice good hygiene, including frequent handwashing and mask-wearing in crowded areas.
- Be aware of potential symptoms and get tested if you experience them.
**Who This Affects Most:**
- Elderly individuals
- Immunocompromised individuals
- Those with pre-existing chronic conditions
FAQ
What are the symptoms of NB.1.8.1?
Symptoms are similar to other Omicron subvariants, including fatigue, fever, sore throat, congestion, and muscle aches.
Are current vaccines effective against NB.1.8.1?
Yes, current COVID-19 vaccines are expected to remain effective against this variant, protecting against severe illness.
Takeaways
- NB.1.8.1 is a newly emerging COVID-19 variant that may spread more easily.
- Symptoms are similar to other Omicron variants, and vaccines are expected to provide protection.
- Stay informed and take necessary precautions, especially if you are in a vulnerable group.
- Health officials are closely monitoring the variant, and more data is needed to determine its true risk.
Discussion
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Disclaimer
This article was compiled by Yanuki using publicly available data and trending information. The content may summarize or reference third-party sources that have not been independently verified. While we aim to provide timely and accurate insights, the information presented may be incomplete or outdated.
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