The new Covid 'Stratus' variant has been spreading rapidly, with two sub-variants, XFG and XFG.3, and it has one key symptom to look out for, according to medical experts View 3 Images Cases of the new Covid variant has been spreading (Image: Getty Images/Stock Photo)

A fresh strain of Covid is spreading at an alarming rate, and it presents a unique symptom that everyone should be mindful of. There's mounting anxiety over the proliferation of the new Covid variant, dubbed 'Stratus', which has two forms, XFG and XFG. 3. ‌

It was first identified in January this year, and by June, the World Health Organisation (WHO) had categorised XFG as 'under monitoring' due to its 'increasing proportions globally'. ‌

As of September 3, the UK Health Security Agency reported a 7.1% su

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