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London, July 4:
A newly identified Covid-19 variant, dubbed ‘Stratus’ and scientifically known as XFG, is spreading swiftly across the United Kingdom, prompting health experts to warn of a potential new wave of infections. The UK Health Security Agency (UKHSA) reports that Stratus has surged from just 10% of Covid cases in May to nearly 40% by mid-June, making it the dominant strain in England.
Stratus is descended from the highly contagious Omicron variant and is classified as a recombinant, or ‘Frankenstein,’ strain—emerging from a hybrid infection involving two separate Covid variants. Both the main XFG strain and its fast-growing sub-lineage, XFG.3, are rapidly gaining ground, according to virologists.
“Immunity is waning in the population as booster uptake has declined and recent infection rates were low. That makes more people vulnerable to Stratus,” explained Professor Lawrence Young, a virologist at Warwick University. He emphasized, however, that there is currently no evidence the new variant causes more severe illness. “Vaccination still offers strong protection against serious outcomes,” Professor Young added.
The World Health Organization (WHO) has listed Stratus as a ‘variant under monitoring’ and assessed its overall risk as low. Nonetheless, with Stratus now responsible for approximately 22% of global Covid cases, the WHO has acknowledged its significant growth advantage.
Symptoms associated with Stratus are similar to previous Covid variants and include cough, fatigue, high temperature, sore throat, and headache. Dr. Kaywaan Khan, a general practitioner and founder of the Hannah London Clinic, noted one distinct symptom: hoarseness, or a scratchy, raspy voice. “Though symptoms tend to be mild to moderate, people who test positive must isolate as the strain is highly contagious,” Dr. Khan advised.
Health authorities are closely monitoring the situation and urge the public to remain vigilant, practice good hygiene, and follow recommended preventive measures.
Disclaimer:
This article is based on currently available information as of July 5, 2025. The situation regarding Covid-19 variants is rapidly evolving. For the most up-to-date guidance and health advice, please consult official sources such as the UK Health Security Agency and the World Health Organization.
