New 'Cicada' Covid Variant Poised to Become Dominant Strain in the UK
A highly mutated new Covid-19 variant, dubbed the 'Cicada' strain, is on track to become the dominant coronavirus variant circulating within the United Kingdom. Health officials and leading scientists are issuing urgent warnings about its potential to evade prior immunity and drive a fresh wave of infections, particularly among vulnerable groups and children.
Variant Characteristics and Global Spread
The variant, formally designated BA.3.2, is a descendant of the Omicron lineage. It boasts an alarming 75 genetic mutations concentrated in its spike protein, the key mechanism the virus uses to enter human cells. This extensive mutation profile suggests a significant capacity for immune evasion, meaning antibodies from previous vaccinations or infections may be less effective at recognising and neutralising it.
Professor Ravi Gupta of the University of Cambridge, who advised the government during the pandemic, confirmed the variant's presence in the UK and its increasing prevalence. "I would expect it to become the dominant strain," he stated, noting that BA.3.2 is "different from the viruses we have been dealing with for the last two years."
First detected in South Africa in 2024 before appearing to go dormant, the Cicada variant has re-emerged globally. As of last month, it had been identified in nearly 23 countries. In the United States, it has been detected in wastewater systems across 29 states. Data from late 2025 to early 2026 showed it comprised around 30% of sequenced cases in several European nations, including Denmark, Germany, and the Netherlands.
Transmission, Symptoms, and Public Health Advice
Early evidence indicates the Cicada variant spreads faster than other circulating strains. There is particular concern it could spread most efficiently among children who have no prior Covid immunity, potentially acting as a catalyst for a new infection wave. Symptoms are reported to be similar to recent variants, including sore throat, cough, congestion, fatigue, headache, and fever. However, the US Centers for Disease Control and Prevention (CDC) notes some cases also involve gastrointestinal issues like nausea or diarrhoea.
While there is no current evidence the variant causes more severe disease intrinsically, experts warn that higher infection rates could lead to a greater absolute number of severe cases. The elderly and immunocompromised remain at highest risk.
In response, healthcare professionals are reiterating fundamental precautions. Dr. Sai Balasubramanian, a physician and healthcare strategy executive, explicitly called for a return to masking in high-risk settings. "It is time to mask up to avoid transmission," he advised, recommending masks in crowded indoor areas.
The broader public health guidance remains:
- Get vaccinated and boosted when eligible.
- Wear masks in crowded indoor spaces.
- Avoid contact with individuals known to be ill.
- Practice frequent hand hygiene.
- Stay informed about local infection rates and guidelines.
Vaccination and Immunity Landscape
Experts stress that while current vaccines may be less effective at preventing infection from the Cicada variant, they still offer crucial protection against severe illness, hospitalisation, and death. Professor Gupta affirmed that "vaccines should prevent some of the most severe complications in most people."
The NHS continues its seasonal vaccination programme. Free jabs are offered in spring and early winter to eligible groups, including:
- Individuals aged 75 and over.
- Those aged 6 months to 74 years with a weakened immune system due to a health condition or treatment.
- Residents of care homes for older adults.
For those not eligible on the NHS, Covid-19 boosters are available privately at High Street pharmacies, typically costing between £75 and £100. The UK Health Security Agency (UKHSA) is actively monitoring the variant and conducting tests to better understand its properties. The public is advised to contact their GP if unsure of their vaccination eligibility, as the virus demonstrates it can cause waves of infection year-round, not just in traditional flu season.
