This strain is termed Stratus and encompasses two variants, XFG and XFG. Dr Alex Allen, consultant epidemiologist at the UK Health Security Agency (UKHSA), said: "It is normal for viruses to mutate and change over time." Speaking on This Morning yesterday, Dr Sara explained: "We know that Covid cases are rising with some new variants, they're called Nimbus and Stratus. She informed viewers and the presenters that people can exhibit any other usual Covid symptoms alongside it, such as headaches, coughing, runny nose and blocked nose. He added: "Vaccination offers the best protection against flu, Covid-19 and RSV which is why it's vital that eligible groups get vaccinated.