After Nimbus, now it’s time for Stratus.
A new COVID-19 variant called Stratus (also known as XFG) is quietly but rapidly spreading in the US and around the world. While experts reassure that the overall risk remains low, Stratus is being closely tracked by the
World Health Organization as a Variant Under Monitoring due to its fast transmission and ability to sidestep some immunity. Its most distinctive symptom? A hoarse or raspy voice that can appear before the usual signs of COVID-19.
As Stratus gains ground, making up nearly 23% of global COVID-19 cases, it's critical to understand its symptoms, the risk it carries, and how you can protect yourself and others.
Let’s get informed, safe, and ready.
The Stratus Variant: What is it and why does it matter
Stratus (XFG) is a recombinant subvariant, meaning it formed when two previous variants, LF.7 and LP.8.1.2, merged genetically, earning it the nickname “Frankenstein variant.”
First picked up in Canada, it has since spread to at least 38 countries, including the US, Europe, and Asia-Pacific.
Data shows that Stratus has climbed from about 7% of global COVID cases in May to nearly 23% by late May, making it the third-most common variant in the US by June. Experts attribute this rapid growth to its ability to evade existing immunity and thrive in populations with low booster coverage.
Despite this growth, health experts emphasize that it does not cause more severe illness than earlier variants.
Key symptoms: What to look for
Stratus shares many of the usual COVID symptoms and of earlier Omicron subvariants, but has one standout early sign: hoarseness or a raspy and scratchy voice. Some patients describe this as feeling like “swallowing glass,” a painful and sharp sting in the throat. Common COVID-like symptoms include fever or chills, dry cough or sore throat, fatigue, headache, muscle aches, nasal congestion or runny nose, and occasional nausea, vomiting, or diarrhea.
According to reports, hoarseness often appears early and may be followed by these typical symptoms. Unlike the “razor-blade” throat associated with the Nimbus strain, Stratus more often starts with voice changes and discomfort in the throat region.
Spread in the United States of America
While the previously dominant Nimbus variant (NB.1.8.1) still holds a share of cases, Stratus is quickly making headway. In England, Stratus rose from around 10% to 40% of COVID cases in just weeks. The World Health Organization now lists both Nimbus and Stratus as Variants Under Monitoring, emphasizing their spread even as overall severity remains low. In the US, Stratus is becoming more common and may drive more cases simply due to its high transmissibility.
Recent CDC estimates and reporting suggest that Stratus is one of the top three COVID variants currently circulating in the US, including Arkansas, Hawaii, Illinois, Iowa, Kentucky, North Carolina, Ohio, Pennsylvania, Texas, and Virginia. Additionally, it's likely growing in California, Georgia, New York, New Jersey, Tennessee, and more.
Severity and vaccination
According to WHO, vaccines, especially updated boosters, still offer strong protection against severe illness, hospitalization, and death due to Stratus, despite a minor drop in antibody effectiveness. Some lab tests show a roughly two-fold decline in antibody neutralization compared to earlier variants, but protection remains robust.
So while Stratus can spread faster and sometimes lead to mild symptoms, vaccination remains the most effective defense.
Prevention measures to take
Public health experts emphasize that strategies effective against earlier Omicron variants remain powerful against Stratus:
Stay updated with vaccines: If eligible, get the latest booster shot, which boosts protection against hospitalization.
Test early if you feel sick: Seek a COVID-19 test, especially if you develop a hoarse voice or sore throat without a clear cause. Early detection allows for timely care.
Mask in crowded indoor spaces: In areas with rising respiratory illness, wearing a well-fitted mask and maintaining distance can reduce spread risk.
Practice good hygiene: Wash your hands frequently, avoid touching your face, and clean high-touch surfaces regularly.
Keep indoor air clean: Improving ventilation or using HEPA filters helps reduce viral particles in shared indoor spaces.
Stay home if you’re sick: If you develop symptoms, especially respiratory, fever, or throat irritation, stay isolated for at least 48 hours after recovery to prevent spreading.
Follow CDC alerts: Monitor local public health updates, especially as immunity fades and eligibility for boosters narrows
If you develop a hoarse throat, especially if it comes on suddenly and without a clear cause, take it seriously. Stay home, test for COVID-19, and follow hygiene and isolation guidelines. Keep your vaccinations current and follow basic precautions, especially in settings with vulnerable individuals. Even if Stratus is not more harmful, its higher spread can still impact community health.
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