Covid Variants Nimbus and Stratus Are Rising Rapidly — Plus Some Uncommon Symptoms

New Covid Variants Bring Distinct Symptoms

A hoarse voice and intense “razor blade” sore throat are emerging as common signs of the latest Covid variants spreading across Britain and the US.

The strains—XFB, nicknamed Stratus, and NB.1.8.1, called Nimbus—are driving a surge in infections, with cases doubling since August. In response, health authorities have launched a winter vaccination campaign for Covid and flu, urging widespread participation as hospital admissions rise.

In the UK, the Health Security Agency (UKHSA) reported positivity rates climbing from 7.6% to 8.4% in a week, and hospital admissions increasing from 2.0 to 2.73 per 100,000 people.

In the US, Covid levels in wastewater are considered “moderate” nationally, but four states report “very high” readings, with northeastern states seeing upward trends. Dr. Aaron Glatt noted patients describing severe throat pain, likening it to having “razor blades” in their throat, a symptom associated with these newer variants.

Other symptoms remain familiar, including headaches, coughs, fatigue, and nasal congestion. Experts say the new variants are not more dangerous than previous ones, though they spread more easily due to genetic mutations.

Covid testing is no longer free on the NHS, but tests remain available for purchase. The UKHSA recommends anyone with symptoms stay home, avoid contact with vulnerable individuals, and wear face coverings if going out. Winter Covid boosters are available for over-75s, immunocompromised individuals, pregnant women, and children.

Amid rising cases, a controversial South Korean study claimed Covid vaccines might increase cancer risk. Experts have dismissed these claims as overstated, emphasizing there is no credible evidence linking Covid vaccination to cancer development.