Overview

• UKHSA identifies XFG (Stratus) and NB.1.8.1 (Nimbus) as the most common variants in the UK, with hospital admissions rising to 2.73 per 100,000 from 2.00 the prior week alongside higher test positivity.
• CDC wastewater surveillance as of September 20 shows national Covid activity at a moderate level with 19 states at high or very high, and reports indicate Stratus is rapidly gaining share in the US.
• WHO lists XFG as a variant under monitoring and assesses the global public‑health risk from it as low based on available evidence.
• Clinicians describe distinctive throat symptoms linked to the current wave, including a hoarse or raspy voice and an intense “razor blade” sore throat, occurring with familiar respiratory complaints.
• US advisers recommend the 2025–2026 updated Covid vaccines for people aged six months and older, and UK guidance urges eligible groups to get seasonal shots and to follow stay‑home, masking, hygiene and ventilation advice when ill.