A surge in flu and other respiratory viruses could put pressure on people's health and the NHS this winter, warns a report by leading medics.
They say testing for flu, Covid and a respiratory virus common in children and the elderly - called RSV - may help doctors treat cases more quickly.
The Academy of Medical Sciences report calls for people with any symptoms to isolate and stay at home.
This will help protect against all respiratory viruses this winter.
The report, by 29 leading experts and requested by the government, says there is great uncertainty about what the next few months will hold across the UK, but it urges policymakers to prepare for a challenging winter.
Comeback of winter viruses
During lockdown last winter, the UK population was hardly exposed to the viruses which normally circulate. But they are now set to make a comeback as restrictions lift and society opens up.
Already this summer, there has been
a rise in winter viruses in children coming to A&E.
Report author Prof Azra Ghani, from Imperial College London, says their modelling suggests a summer peak of Covid-19 infections "with subsequent local outbreaks over winter".
But "we can't completely rule out another winter wave", she said.
"Whilst we expect the peak in deaths to be considerably lower than last winter, under some scenarios we could see hospital admissions rise to similar levels."
In a worst-case scenario this could mean around twice the levels of flu and respiratory syncytial virus (RSV) as a normal autumn and winter, the report says.
There are between 10,000 and 30,000 deaths from flu in a normal winter, and about 20,000 children under five are admitted to hospital each year with RSV, which can cause a lung infection called bronchiolitis.