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A crucial symptom could show that an illness is Covid-19 rather than flu, the NHS has indicated.

The NHS has warned that cases of both viruses have been climbing in recent weeks.

Latest figures from the UK Health Security Agency (UKHSA) revealed that flu positivity rose from 1.9 per cent to 3.3 per cent.

Meanwhile, Covid-19 positivity in hospital settings climbed from 11.7 per cent in the previous week to 12.9 per cent.

Telling whether an illness is Covid or flu without conducting a is hard as many of the symptoms overlap, reports the Mirror .

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The NHS website says that Covid symptoms are "very similar to symptoms of other illnesses, such as colds and flu".

Both conditions can trigger a high temperature

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