This new strain of coronavirus is already present in Asia, Europe and America.
Recently, the World Health Organization (WHO) confirmed that in recent months there has been a specific increase in confirmed cases of the new Covid-19 variant identified as NB.1.8.1, which is also known as Nimbus or “razor throat” and after this announcement thousands of people have shown interest in knowing what the symptoms of this new strain of the coronavirus are and what all its implications are, therefore, in this note we will tell you everything that is known about it.
According to the latest report issued by the World Health Organization (WHO), so far in 2025, different variants have circulated around the world, which confirms that the virus continues to evolve. It was specified that from January to May the variant that predominated worldwide was the XEC and in second place was the KP.3.1.1. and during March the LP.8.1 variant was the one that reached the highest number of cases, however, in April its presence began to decrease and since then the Nimbus variant or “razor throat” has shown an increase , which is why it is currently the main variant that is under surveillance.
The World Health Organization (WHO) specified that the NB.1.8.1 variant is a descendant of the XDV.1.5.1 and JN.1 variants and highlights that due to its mutations it is a highly transmissible strain , in addition, it has the ability to neutralize certain antibodies.
As of May 18, 2025, there are 512 recorded cases of the NB.1.8.1 variant of Covid-19, located in 22 countries in Asia, Europe, and the Americas. It was noted that in the Americas, this strain has only been detected in the United States.
Given this situation, the World Health Organization (WHO) stated that it is maintaining “limited” surveillance of the behavior of the NB.1.8.1 Covid-19 variant and called on all its Member States to maintain comprehensive Covid-19 control programs based on vaccination, as this is the only way to prevent serious conditions that could lead to death, and urged that emphasis be placed on at-risk groups.
What are the symptoms of the “razor throat” variant of Covid-19?
According to reports from various health-related websites, symptoms of the NB.1.8.1, “Nimbus” or “razor throat” variant of Covid-19 include runny nose, headache, fatigue, sneezing, generalized body aches, and intense pain and burning in the throat , which is why people infected with this strain compare the sensation to a “cutting” effect.
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In some cases, digestive discomfort such as nausea, diarrhea, and vomiting may also occur . However, the symptoms and course of these will vary depending on the individual. However, as mentioned above, vaccination is key to avoiding major effects.
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