Health officials in the UK and United States are monitoring a rise in Covid-19 cases tied to two fast-spreading variants:
XFB (Stratus) and NB.1.8.1 (Nimbus). Data show increasing spread, with
UK test positivity above 8% and U.S. wastewater signals indicating high viral levels, suggesting wider community transmission.
What sets this wave apart is symptoms.
Many patients report extremely sore throats, often described as feeling like “razor blades,” along with hoarseness, fatigue, headaches, congestion, and coughs.
Experts say the variants are not necessarily more severe but are more transmissible, raising concerns about strain on healthcare systems.
Genetic data show mutations that improve spread, though vaccines still protect against severe illness.
Health officials urge vaccination, staying home when sick, masking in crowded indoor spaces, and testing.
They stress calm vigilance, noting immunity and treatments are stronger than earlier in the pandemic.
