New, Highly Transmissible COVID-19 Strain Fueling Wave of Infections Across US

Introduction to the Stratus Variant

Just in time for respiratory virus season, a highly transmissible COVID-19 strain is fueling a wave of infections across the US. The XFG variant, informally known as “Stratus,” has been driving up case numbers. Stratus’ ability to evade immune system defenses has propelled it past NB.1.8.1 (aka “Nimbus”) as the dominant Covid strain.

Characteristics of the Stratus Variant

The XFG variant, informally known as “Stratus,” has been driving up COVID-19 case numbers just in time for respiratory virus season. Prostock-studio – stock.adobe.com
The level of Covid viral activity in wastewater is “moderate” nationally, according to Sept. 20 data, the latest available from the Centers for Disease Control and Prevention. Nineteen states are reporting “high” or “very high” levels of the virus in wastewater, with Nevada, Utah, Connecticut and Delaware leading the way. Stratus, a hybrid of two Omicron sub-strains, was initially detected in January in Southeast Asia and in the US in the spring.

Spread and Classification

It had spread to 38 countries by June, prompting the World Health Organization to describe it as a “variant under monitoring.” Stratus is known to cause hoarseness and a scratchy or sore throat, which can be mistaken for allergies. Experts strongly recommend staying home if you’re sick with a virus so you don’t spread it to others. Syda Productions – stock.adobe.com

Comparison with Other Variants

Stony Brook Medicine reports that most Stratus cases are mild, especially for those who are vaccinated. Yet the strain carries unique mutations that enhance its ability to evade antibodies gained from prior Covid infections or vaccinations. That it’s been able to surpass Nimbus is surprising since Nimbus is skilled at binding to human cells, allowing it to spread quickly. An Omicron subvariant, Nimbus wreaked havoc this summer in the US. It’s known for causing a severe sore throat, ominously called “razor blade” throat.

Protection and Prevention

To protect against Covid and other respiratory viruses, health experts advise practicing good hygiene, improving indoor air ventilation and filtration and staying up to date with vaccines. The CDC’s Advisory Committee on Immunization Practices (ACIP) recently recommended the 2025-2026 updated Covid vaccines for anyone 6 months and older after consulting a doctor or pharmacist.

Conclusion

The emergence of the Stratus variant highlights the ongoing need for vigilance and proactive measures against COVID-19. As the US enters the fall respiratory illness season, it is crucial for individuals to stay informed, follow health guidelines, and take necessary precautions to protect themselves and their communities.

FAQs

• Q: What is the Stratus variant?
  A: The Stratus variant, also known as XFG, is a highly transmissible COVID-19 strain that has been driving up case numbers in the US.
• Q: How does Stratus compare to other variants?
  A: Stratus has surpassed Nimbus as the dominant Covid strain due to its ability to evade immune system defenses, despite Nimbus being skilled at binding to human cells.
• Q: What symptoms does Stratus cause?
  A: Stratus is known to cause hoarseness and a scratchy or sore throat, which can be mistaken for allergies.
• Q: How can I protect myself against Stratus and other respiratory viruses?
  A: Health experts recommend practicing good hygiene, improving indoor air ventilation and filtration, and staying up to date with vaccines.
• Q: Are the new COVID-19 vaccines effective against Stratus?
  A: The CDC’s Advisory Committee on Immunization Practices (ACIP) has recommended the 2025-2026 updated Covid vaccines for anyone 6 months and older after consulting a doctor or pharmacist, indicating they are expected to provide protection against current variants, including Stratus.