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URLhttps://www.wired.com/story/who-monitors-new-covid-variant-nb181-spread-america-europe-nimbus/
Last Crawled2026-04-26 08:58:15 (2 days ago)
First Indexed2025-06-10 09:07:22 (10 months ago)
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Meta TitleWHO Monitors New Covid Variant Spreading in America and Europe | WIRED
Meta DescriptionNB.1.8.1 has mutations that could increase the virus’s transmissibility and decrease the efficacy of certain neutralizing antibodies against it.
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A new Covid variant is being kept under surveillance by the World Health Organization (WHO) as its emergence has led to an increase in infections in several regions of the world. First identified at the end of January, the variant—called NB.1.8.1 but known informally as “Nimbus”—is a descendant of the Omicron family of Covid sublineages, and has become increasingly prevalent throughout the spring in Europe, the Americas, and the Western Pacific. The virus has mutations that may increase its infectiousness and allow it to escape certain antibodies. Nevertheless, “considering the available evidence, the additional public health risk posed by NB.1.8.1 is evaluated as low at the global level,” the WHO wrote in its most recent risk evaluation for the variant. WIRED's Guide to How the Universe Works Your weekly roundup of the best stories on health care, the climate crisis, new scientific discoveries, and more. Like other variants before it, Nimbus has specific mutations to its spike protein. These proteins coat the virus’s surface and are what it uses to gain entry into cells, where it reproduces. Nimbus’ spike protein modifications could increase its transmission capacity and partially reduce the neutralizing efficacy of certain antibodies generated by previous infections, both of which would contribute to its spread. However, the WHO says that there is no evidence that this variant causes more severe disease compared to other strains currently circulating. Nor have increases in hospitalizations or deaths related to its emergence been observed. Symptoms associated with NB.1.8.1 are similar to those caused by other SARS-CoV-2 variants: sore throat, cough, fatigue, fever, muscle aches, loss of taste or smell, respiratory distress, nausea, vomiting, and diarrhea. The WHO experts explain that, although this variant may partially evade some antibody responses, such “immune escape” is comparable to that observed in other Omicron sublineages. This suggests that the mutations present in NB.1.8.1 do not give the virus increased resistance to antivirals such as nirmatrelvir, and that current vaccines continue to be effective in preventing severe disease when infected with this version of the virus. However, to those most vulnerable to Covid—such as the elderly, immunocompromised, or those with preexisting chronic conditions—Nimbus represents a new health threat, and these groups should stay up to date with booster vaccinations to ensure they are protected against Covid’s worst effects. This story originally appeared on WIRED en Español and has been translated from Spanish.
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[Skip to main content](https://www.wired.com/story/who-monitors-new-covid-variant-nb181-spread-america-europe-nimbus/#main-content) [SECURITY](https://www.wired.com/category/security/) [POLITICS](https://www.wired.com/category/politics/) [THE BIG STORY](https://www.wired.com/category/big-story/) [BUSINESS](https://www.wired.com/category/business/) [SCIENCE](https://www.wired.com/category/science/) [CULTURE](https://www.wired.com/category/culture/) [REVIEWS](https://www.wired.com/category/gear/) [SUBSCRIBE](https://www.wired.com/v2/offers/wira01035?source=Site_0_JNY_WIR_DESKTOP_NAV_CTA_0_US_ACQ_NLI_CONTROL_GENERIC_ZZ) [Newsletters](https://www.wired.com/newsletter?sourceCode=hamburgernav) [SUBSCRIBE](https://www.wired.com/v2/offers/wira01035?source=Site_0_JNY_WIR_DESKTOP_NAV_CTA_0_US_ACQ_NLI_CONTROL_GENERIC_ZZ) [Security](https://www.wired.com/category/security/) [Politics](https://www.wired.com/category/politics/) [The Big Story](https://www.wired.com/category/big-story/) [Business](https://www.wired.com/category/business/) [Science](https://www.wired.com/category/science/) [Culture](https://www.wired.com/category/culture/) [Reviews](https://www.wired.com/category/gear/) More [The Big Interview](https://www.wired.com/the-big-interview/)[Magazine](https://www.wired.com/magazine/)[Events](https://www.wired.com/tag/wired-events/)[WIRED Insider](https://www.wired.com/collection/wiredinsider/)[WIRED Consulting](https://www.wired.com/tag/wired-consulting/) [Newsletters](https://www.wired.com/newsletter?sourceCode=hamburgernav) [Podcasts](https://www.wired.com/podcasts/) [Video](https://www.wired.com/video/) [Livestreams](https://www.wired.com/livestreams) [Merch](https://shop.wired.com/) [Search](https://www.wired.com/search/) [Sign In](https://www.wired.com/auth/initiate?redirectURL=%2Fstory%2Fwho-monitors-new-covid-variant-nb181-spread-america-europe-nimbus%2F&source=VERSO_NAVIGATION) [START FREE TRIAL](https://www.wired.com/v2/offers/wira01035?source=Site_0_JNY_WIR_DESKTOP_NAV_DRAWER_0_US_ACQ_NLI_CONTROL_GENERIC_ZZ) [![ZOOM IN \<br\> Subscribe today for only \<del\>\$4\</del\> \<strong\>\$2/month\</strong\> and get access to exclusive benefits including \<strong\>5 all-new premium newsletters.\</strong\> CTA:SUBSCRIBE](https://assets.bonappetit.com/photos/686ea38fcb59aaabef7a795d/original/pass/Wired_Zoom_Rollover_300x200_v2a_Shorter.gif?format=original)](https://www.wired.com/v2/offers/wira01035?source=Site_0_JNY_WIR_NAV_ROLLOVER_0_US_ACQ_NLI_CONTROL_GENERIC_ZZ) [Sign In](https://www.wired.com/auth/initiate?redirectURL=%2Fstory%2Fwho-monitors-new-covid-variant-nb181-spread-america-europe-nimbus%2F&source=VERSO_NAVIGATION) The intersection of technology, power, and culture. Start your free trial and get access to **5 all-new premium newsletters.** [START FREE TRIAL](https://www.wired.com/v2/offers/wira01035?source=Site_0_JNY_WIR_DESKTOP_PAYWALL_THIN_0_US_ACQ_NLI_CONTROL_GENERIC_ZZ) [Fernanda GonzĂĄlez](https://www.wired.com/author/fernanda-gonzalez/) [Science](https://www.wired.com/category/science) Jun 10, 2025 5:00 AM # WHO Monitors New Covid Variant Spreading in America and Europe NB.1.8.1 has mutations that could increase the virus’s transmissibility and decrease the efficacy of certain neutralizing antibodies against it. ![Image may contain Baby and Person](https://media.wired.com/photos/6846f15aba1aa63e345a0ca5/3:2/w_2560%2Cc_limit/covid-test-sci-1371481334.jpg) Photograph: Calvin Chan Wai Meng Save this story Save this story A new Covid variant is being kept under surveillance by the World Health Organization (WHO) as its emergence has led to an increase in infections in several regions of the world. First identified at the end of January, the variant—called NB.1.8.1 but known informally as “Nimbus”—is a descendant of the Omicron family of Covid sublineages, and has become increasingly prevalent throughout the spring in Europe, the Americas, and the Western Pacific. The virus has mutations that may increase its infectiousness and allow it to escape certain antibodies. Nevertheless, “considering the available evidence, the additional public health risk posed by NB.1.8.1 is evaluated as low at the global level,” the WHO wrote in its most recent [risk evaluation](https://cdn.who.int/media/docs/default-source/documents/epp/tracking-sars-cov-2/23052025_nb.1.8.1_ire.pdf) for the variant. ### WIRED's Guide to How the Universe Works Your weekly roundup of the best stories on health care, the climate crisis, new scientific discoveries, and more. Like other variants before it, Nimbus has specific mutations to its spike protein. These proteins coat the virus’s surface and are what it uses to gain entry into cells, where it reproduces. Nimbus’ spike protein modifications could increase its transmission capacity and partially reduce the neutralizing efficacy of certain antibodies generated by previous infections, both of which would contribute to its spread. Featured Video [Doctor Answers Lung Questions From Twitter](https://www.wired.com/video/watch/tech-support-lung-support) However, the WHO says that there is no evidence that this variant causes more severe disease compared to other strains currently circulating. Nor have increases in hospitalizations or deaths related to its emergence been observed. Symptoms associated with NB.1.8.1 are similar to those caused by other SARS-CoV-2 variants: sore throat, cough, fatigue, fever, muscle aches, loss of taste or smell, respiratory distress, nausea, vomiting, and diarrhea. The WHO experts explain that, although this variant may partially evade some antibody responses, such “immune escape” is comparable to that observed in other Omicron sublineages. This suggests that the mutations present in NB.1.8.1 do not give the virus increased resistance to antivirals such as nirmatrelvir, and that current vaccines continue to be effective in preventing severe disease when infected with this version of the virus. However, to those most vulnerable to Covid—such as the elderly, immunocompromised, or those with preexisting chronic conditions—Nimbus represents a new health threat, and these groups should stay up to date with booster vaccinations to ensure they are protected against Covid’s worst effects. *This story originally appeared on* [WIRED *en Español*](https://es.wired.com/articulos/la-oms-vigila-la-nueva-variante-de-covid-nb181-tras-su-expansion-en-america-y-europa) *and has been translated from Spanish.* Most Popular - [![Palantir Employees Are Starting to Wonder if They’re the Bad Guys](https://media.wired.com/photos/69d3c62396de4781bbc4cf6e/1:1/w_120%2Ch_120%2Cc_limit/undefined)](https://www.wired.com/story/palantir-employees-are-starting-to-wonder-if-theyre-the-bad-guys/#intcid=_wired-right-rail_dd4552b1-f5ba-45b6-ac23-c41d6c8e0ca8_popular4-2) Politics [Palantir Employees Are Starting to Wonder if They’re the Bad Guys](https://www.wired.com/story/palantir-employees-are-starting-to-wonder-if-theyre-the-bad-guys/#intcid=_wired-right-rail_dd4552b1-f5ba-45b6-ac23-c41d6c8e0ca8_popular4-2) By Makena Kelly - [![Scientists Gave Cocaine to Salmon and You Will Absolutely Believe What Happened Next](https://media.wired.com/photos/69e92e5066ef7baae78bcd9c/1:1/w_120%2Ch_120%2Cc_limit/undefined)](https://www.wired.com/story/cocaine-fueled-wild-salmon-swam-twice-as-far-as-sober-ones/#intcid=_wired-right-rail_dd4552b1-f5ba-45b6-ac23-c41d6c8e0ca8_popular4-2) Environment [Scientists Gave Cocaine to Salmon and You Will Absolutely Believe What Happened Next](https://www.wired.com/story/cocaine-fueled-wild-salmon-swam-twice-as-far-as-sober-ones/#intcid=_wired-right-rail_dd4552b1-f5ba-45b6-ac23-c41d6c8e0ca8_popular4-2) By Marta Musso - [![This Scammer Used an AI-Generated MAGA Girl to Grift ‘Super Dumb’ Men](https://media.wired.com/photos/69de96afb083bab80bea1c92/1:1/w_120%2Ch_120%2Cc_limit/undefined)](https://www.wired.com/story/ai-generated-maga-girls/#intcid=_wired-right-rail_dd4552b1-f5ba-45b6-ac23-c41d6c8e0ca8_popular4-2) Digital Culture [This Scammer Used an AI-Generated MAGA Girl to Grift ‘Super Dumb’ Men](https://www.wired.com/story/ai-generated-maga-girls/#intcid=_wired-right-rail_dd4552b1-f5ba-45b6-ac23-c41d6c8e0ca8_popular4-2) By Ej Dickson - [![Rednote Draws a Line Between China and the World](https://media.wired.com/photos/69e91348580227e02a75f02d/1:1/w_120%2Ch_120%2Cc_limit/undefined)](https://www.wired.com/story/rednote-draws-a-line-between-china-and-the-world/#intcid=_wired-right-rail_dd4552b1-f5ba-45b6-ac23-c41d6c8e0ca8_popular4-2) Business [Rednote Draws a Line Between China and the World](https://www.wired.com/story/rednote-draws-a-line-between-china-and-the-world/#intcid=_wired-right-rail_dd4552b1-f5ba-45b6-ac23-c41d6c8e0ca8_popular4-2) By Zeyi Yang ## You Might Also Like - **In your inbox:** Upgrade your life with [WIRED-tested gear](https://www.wired.com/newsletter/gear?sourceCode=BottomStories) - Is Trump [the antichrist](https://www.wired.com/story/staunch-trump-supporters-are-now-asking-if-hes-the-antichrist/)? Yes, according to some of his supporters - **Big Story:** How the Vision Pro rollout [inflamed tensions at Apple](https://www.wired.com/story/book-excerpt-mutiny-noam-scheiber-apple-vision-pro/) - Iran-linked hackers are [sabotaging energy and water infrastructure](https://www.wired.com/story/iran-linked-hackers-are-sabotaging-us-energy-and-water-infrastructure/) - **Listen:** Silicon Valley is spending millions [to stop one of its own](https://www.wired.com/story/the-big-interview-podcast-new-york-state-representative-alex-bores/) [![](https://media.wired.com/photos/65d492ddb8436a957906d23c/1:1/w_90%2Cc_limit/WhatsApp%2520Image%25202023-01-31%2520at%252014.16.04.jpeg)](https://www.wired.com/author/fernanda-gonzalez/) [Fernanda GonzĂĄlez](https://www.wired.com/author/fernanda-gonzalez/) is a contributor to *WIRED en Español*. ... [Read More](https://www.wired.com/author/fernanda-gonzalez) Topics[science](https://www.wired.com/tag/science/)[health](https://www.wired.com/tag/health/)[COVID-19](https://www.wired.com/tag/covid-19/)[coronavirus](https://www.wired.com/tag/coronavirus/)[public health](https://www.wired.com/tag/public-health/)[infectious disease](https://www.wired.com/tag/infectious-disease/) ### WIRED's Guide to How the Universe Works Your weekly roundup of the best stories on health care, the climate crisis, new scientific discoveries, and more. 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Readable Markdown
A new Covid variant is being kept under surveillance by the World Health Organization (WHO) as its emergence has led to an increase in infections in several regions of the world. First identified at the end of January, the variant—called NB.1.8.1 but known informally as “Nimbus”—is a descendant of the Omicron family of Covid sublineages, and has become increasingly prevalent throughout the spring in Europe, the Americas, and the Western Pacific. The virus has mutations that may increase its infectiousness and allow it to escape certain antibodies. Nevertheless, “considering the available evidence, the additional public health risk posed by NB.1.8.1 is evaluated as low at the global level,” the WHO wrote in its most recent [risk evaluation](https://cdn.who.int/media/docs/default-source/documents/epp/tracking-sars-cov-2/23052025_nb.1.8.1_ire.pdf) for the variant. ### WIRED's Guide to How the Universe Works Your weekly roundup of the best stories on health care, the climate crisis, new scientific discoveries, and more. Like other variants before it, Nimbus has specific mutations to its spike protein. These proteins coat the virus’s surface and are what it uses to gain entry into cells, where it reproduces. Nimbus’ spike protein modifications could increase its transmission capacity and partially reduce the neutralizing efficacy of certain antibodies generated by previous infections, both of which would contribute to its spread. However, the WHO says that there is no evidence that this variant causes more severe disease compared to other strains currently circulating. Nor have increases in hospitalizations or deaths related to its emergence been observed. Symptoms associated with NB.1.8.1 are similar to those caused by other SARS-CoV-2 variants: sore throat, cough, fatigue, fever, muscle aches, loss of taste or smell, respiratory distress, nausea, vomiting, and diarrhea. The WHO experts explain that, although this variant may partially evade some antibody responses, such “immune escape” is comparable to that observed in other Omicron sublineages. This suggests that the mutations present in NB.1.8.1 do not give the virus increased resistance to antivirals such as nirmatrelvir, and that current vaccines continue to be effective in preventing severe disease when infected with this version of the virus. However, to those most vulnerable to Covid—such as the elderly, immunocompromised, or those with preexisting chronic conditions—Nimbus represents a new health threat, and these groups should stay up to date with booster vaccinations to ensure they are protected against Covid’s worst effects. *This story originally appeared on* [WIRED *en Español*](https://es.wired.com/articulos/la-oms-vigila-la-nueva-variante-de-covid-nb181-tras-su-expansion-en-america-y-europa) *and has been translated from Spanish.*
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AuthorFernanda GonzĂĄlez
Publish Time2025-06-10 09:00:00 (10 months ago)
Original Publish Time2025-06-10 09:00:00 (10 months ago)
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