Health experts are urging the public to take a Covid test if they experience specific early symptoms, as a newer variant continues to circulate. The advice comes amid concerns that the latest strain, known as 'Stratus', presents differently from earlier forms of the virus and may be more adept at evading prior immunity.
Identifying the Stratus Variant's Distinct Symptoms
The UK Health Security Agency (UKHSA) first detected the Stratus variant in January 2025. By June, the World Health Organisation (WHO) had placed it "under monitoring". While Covid symptoms can often mirror a common cold or flu, medical professionals point to particular signs linked to this strain.
According to Dr Gareth Nye from the University of Salford, the Stratus variant tends to cause a very sore throat and a hoarse voice, rather than more general symptoms like a persistent cough, high temperature, or body aches. This shift in common presentation means people might not immediately suspect Covid-19.
Why This Variant Poses a Greater Risk
Dr Nye has warned that the Stratus variant could have a higher likelihood of causing illness in those who catch it, as it appears better at evading the immune system. This characteristic means that previous vaccines offer reduced protection, underscoring the importance of current booster programmes.
Infectious disease specialist Dr Peter Chin-Hong from the University of California supported this view, cautioning that Stratus encompasses a "wider range" of symptoms than previous strains. He confirmed that a sore throat remains the most likely symptom and noted that the latest versions are more transmissible.
The Critical Importance of Testing and Isolation
Both experts stress that taking precautions is essential if infection is suspected. Testing yourself and self-isolating are crucial steps to prevent spreading the virus to vulnerable individuals, such as the elderly or those with pre-existing medical conditions whose health could be seriously at risk.
To bolster defences, the NHS has been offering free vaccine boosters since October to specific groups. Those eligible include:
- Adults aged over 75.
- Residents in care homes for older adults.
- People who are immunosuppressed and aged six months and over.
The overarching goal is to safeguard those at the greatest risk of severe health complications from Covid-19. With the Stratus variant in circulation, recognising its distinct early signs and acting promptly by testing is a key public health measure.
