- Stratus (XFG) is a fast-emerging COVID-19 variant now comprising 14% of U.S. cases.
- It’s a recombinant strain showing high transmissibility but not increased severity.
- Vaccines and preventive measures remain effective tools against this variant.
The Stratus variant, officially labeled XFG, has quickly risen in the ranks of circulating COVID-19 strains across the United States. First identified in Southeast Asia in early 2025, it remained relatively obscure until recent months when cases began to rise.
While hoarseness and sore throat are commonly reported early symptoms, experts note that XFG doesn’t currently cause more serious illness compared to other Omicron-related variants.
XFG (Stratus) Variant on the Rise: What You Need to Know About the Latest COVID Strain
XFG’s emergence reflects the ongoing evolution of the virus. Recombinant variants like Stratus develop when two separate strains infect the same individual and merge, creating a new hybrid. This process can introduce changes in transmissibility and immune evasion, although there’s no strong evidence of increased virulence in XFG.
What stands out with XFG is the early onset of voice hoarseness, an uncommon but noticeable symptom compared to prior variants. Other symptoms like mild fatigue, sore throat, and congestion continue to align with typical Omicron presentations, making early detection challenging without testing.
The CDC has not issued new public health mandates yet but continues to monitor XFG’s trajectory closely. Its steady growth—from 0% in March to 14% by late June—highlights the importance of maintaining baseline precautions, especially in high-risk or densely populated environments.
Health experts recommend receiving updated booster doses tailored to Omicron subvariants. These are believed to offer strong protection against severe outcomes caused by XFG. Additionally, individuals with compromised immunity or chronic conditions should stay alert and consider masking even in semi-crowded spaces.
Though the Stratus variant is gaining ground, it does not currently pose a heightened threat. Continued vigilance and updated vaccination remain the best tools to limit its spread.
“Preparedness is the key to prevention—even as the virus evolves, so must our response.” – Dr. Rochelle Walensky
