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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.
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. 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. 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.
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