A new COVID-19 variant, XFG, also known as “Stratus,” is gaining ground in the United States and globally. As per the latest reports, “current COVID-19 vaccines are expected to continue providing protection against symptomatic and severe illness caused by this variant.”
Health authorities in several South-East Asian countries are also reporting rising cases and hospital admissions where XFG is widespread.
Severity and Mortality Risks Remain Low
Early data indicate that XFG does not cause more severe illness or higher mortality than other circulating strains. The World Health Organization (WHO) has placed XFG on its watchlist but assessed the global public health risk as “low”.
US States Seeing High Case Levels
The CDC reports that states including Alabama, Alaska, California, Delaware, Florida, Hawaii, Kentucky, Louisiana, and Texas are facing high or very high case levels.
Other states seeing a steady rise in XFG cases include Connecticut, Georgia, Indiana, Maryland, Michigan, Minnesota, Mississippi, Missouri, New Jersey, New York, North Carolina, Ohio, Oklahoma, Oregon, Pennsylvania, South Carolina, Tennessee, Utah, Virginia, Washington, and Wisconsin.
How XFG Evolved
XFG is a recombinant strain created by merging two earlier variants — F.7 and LP.8.1.2.
The latter, LP.8.1.2, is now the second most common strain in the US. Scientists suggest XFG’s mutations may help it evade the immune system more effectively, although this does not make it spread faster.
Global and US Growth of XFG
- First identified: January in Southeast Asia
- US spread: 0% in March → 2% in April → 6% in May → ~14% by late June (CDC)
- Global spread: 7.4% of cases in early May → 22.7% by end of June (WHO)
WHO confirms, “Current COVID-19 vaccines are expected to remain effective against this variant against symptomatic and severe disease.”
Official Classification
The WHO has designated XFG as a SARS-CoV-2 variant under monitoring (VUM)—spreading internationally but not currently considered a major additional threat.
Symptoms of XFG “Stratus”
The CDC notes symptoms remain consistent with other COVID-19 variants, including:
- Fever or chills
- Cough
- Fatigue
- Sore throat
- Loss of taste or smell
- Congestion
- Muscle aches
- Shortness of breath
- Headache
- Nausea or vomiting
Bottom Line
XFG “Stratus” is spreading quickly in the US and globally, but experts say it does not appear to be more dangerous than existing strains—and vaccines are still expected to protect against severe illness.
