Autumn brings many things: cooler weather, pumpkin carving, and longer walks outside. Yet the season also carries a downside—rising rates of respiratory illness.
The Nimbus variant of COVID-19 was uncovered in the summer of 2025. Now, as fall begins, another newly identified variant has appeared: Stratus, more formally known as XFG. Stratus is a recombinant virus, formed from two variants, LF.7 and LP.8.1.2. It first emerged in Canada but has since spread worldwide.
What Should You Know About Stratus?
Experts believe Stratus may be a major driver of recent U.S. case surges, though Nimbus still plays a role. CDC wastewater data now mark COVID-19 activity as very high across 19 states.
Stratus, like its sibling variant Nimbus, belongs to the Omicron subtype of COVID-19. More than 1,000 such sublineages already exist, each carrying its own nickname from experts. Regardless of designation, all these variants fall under the same COVID-19 umbrella.
Omicron sub-variants share predictable features: they spread easily, reproduce in the upper respiratory tract, and tend to cause less severe symptoms. However, their mutations allow them to better evade the immune system, keeping their overall public health impact comparable to earlier variants.
What Symptoms Are Linked to Stratus?
Symptoms of Stratus largely mirror those of other Omicron subtypes. Common signs include cough, fatigue, congestion, headache, and sometimes fever. Gastrointestinal issues may also appear.
Like Nimbus, Stratus is marked by throat-related symptoms. While Nimbus became known for “razor throat,” Stratus seems to cause hoarseness, leaving voices scratchy or raspy. Though not yet confirmed through formal studies, medical professionals have observed these patterns anecdotally.
On August 29, the European Centre for Disease Prevention and Control added Stratus to its list of variants under monitoring. Alongside Nimbus and LP.8.1, Stratus remains under close watch for global spread. The next classification levels are “variant of interest” and then “variant of concern” (VOC), though no current strain has yet reached VOC status.
Does the COVID-19 Vaccine Protect against Stratus?
Experts say the current COVID-19 vaccine should still offer protection against Stratus. In addition to vaccination, other precautions remain important: wearing a mask, using air filtration or ventilation, avoiding crowded spaces, and practicing social distancing.
In September, a federal vaccine advisory panel debated changes to vaccine access. One proposal to require a prescription was rejected, but the panel did vote to recommend COVID-19 vaccination primarily for adults 65 and older. For younger groups, the guidance suggests weighing risks and benefits based on complication potential.
The CDC generally follows the panel’s advice, though authorization rests with acting director Jim O’Neill, who replaced Susan Moneriz after her removal earlier this year.
Conclusion
Stratus adds yet another layer to the evolving COVID-19 landscape. Its spread, symptoms, and potential impact highlight the importance of ongoing vigilance. Vaccination and protective measures remain the best tools for reducing risk.
Have an upcoming trip? Passport Health offers a wide variety of options to help keep you safe from disease, including vaccines. Call or book online to schedule your appointment today.
Logan Hamilton is a health and wellness freelance writer for hire. He’s passionate about crafting crystal-clear, captivating, and credible content that elevates brands and establishes trust. When not writing, Logan can be found hiking, sticking his nose in bizarre books, or playing drums in a local rock band. Find him at loganjameshamilton.com.
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