XFG Variant Drives UK Autumn Covid Surge; What Is 'Stratus' and Symptoms to Watch for "American Covid"

The XFG variant, also known as Stratus or "American Covid," is driving a sharp rise in UK Covid hospitalizations. Here's what the variant is, the symptoms to watch for, and why officials say there's no cause for alarm.

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UK Covid hospitalizations have risen sharply this autumn, driven by the XFG variant also known as Stratus, and nicknamed "American Covid." The UK Health Security Agency (UKHSA) reports hospital admissions linked to the disease increased by almost 50%, with positive Covid tests in hospitals rising from 5.9% to 7%. London has seen the sharpest spike, with admissions up 79% in seven days.

What Is the XFG Variant?

XFG is a recombinant variant of SARS-CoV-2, formed from two earlier Omicron subvariants: LF.7 and LP.8.1.2. It was first detected on January 27, 2025, and the World Health Organization classified it as a Variant under Monitoring in June 2025. It became the dominant strain in the United States, which led to the "American Covid" nickname. It has been circulating in Europe and North America since the end of 2025 and now accounts for more than half of sequenced positive samples in England.

Key Symptoms to Watch

Symptoms linked to XFG are broadly similar to other recent Covid variants, but some stand out:

• Sore throat - often described as particularly painful, with some media dubbing it "razor-blade throat"
• Hoarse voice - a distinct scratchy or raspy voice has been reported anecdotally
• Cough and congestion - persistent dry cough and blocked nose
• Fatigue and muscle aches - pronounced tiredness and body pain
• Gastrointestinal issues - some doctors report diarrhoea, nausea, or stomach pain
• Fever or chills - low-grade fever is common

The UKHSA notes that symptoms have changed over time, with many people now experiencing cold-like symptoms rather than the loss of taste or smell that defined earlier variants.

Is XFG More Dangerous?

Public health officials say there is no evidence that XFG causes more severe illness than previous strains. The variant shows modest immune escape and a growth advantage, but no signal of increased clinical severity. One review described XFG's evolution as "quiet" more consistent with antigenic fine-tuning than a shift toward greater virulence.

"While Covid-19 activity has shown some recent increases, cases remain at low levels in the UK. We're also not seeing any evidence that these are making people ill or spreading faster than before," said Alex Allen, consultant epidemiologist at the UKHSA.

What You Should Do

The autumn vaccination programme is designed to protect against XFG and related variants. Eligible groups including people aged 75 and above, care home residents, and those with weakened immune systems are urged to get vaccinated. The NHS advises anyone who thinks they have Covid to avoid contact with others for five days, or three days if under 18.

Here is the question The Silicon Review raises. The XFG variant is spreading rapidly and hospitalizations are climbing, yet officials insist the risk remains low. When a variant is this transmissible but seemingly mild, what does it mean for the way we live with Covid as it continues to evolve?

FAQ:

Q: What is the XFG variant?
A: XFG, also known as Stratus or "American Covid," is a recombinant Omicron variant formed from LF.7 and LP.8.1.2. It was first detected in January 2025.

Q: What are the symptoms of the XFG variant?
A: Common symptoms include sore throat (sometimes severe), hoarse voice, cough, congestion, fatigue, muscle aches, and fever. Some people also report gastrointestinal issues like diarrhoea or nausea.

Q: Is XFG more dangerous than other Covid variants?
A: No. Health officials say there is no evidence XFG causes more severe illness than previous strains. It shows modest immune escape but no increased clinical severity.

Q: Why is XFG called "American Covid"?
A: The variant became the dominant strain in the United States, leading to the nickname "American Covid."

Q: How many Covid cases are there in the UK?
A: UKHSA data shows 1,374 Covid cases in August 2026, rising 230% to 4,589 in September. Hospital admissions jumped from 950 to 4,939 over the same period.

Q: Should I get vaccinated against XFG?
A: The UK autumn vaccination programme is designed to protect against XFG. Eligible groups, including those aged 75 and over and people with weakened immune systems, are urged to get vaccinated.