Doctors are carefully monitoring a new strain of the virus which causes Covid - and have put together a comprehensive list of symptoms. There is concern for the NB.1.8.1 strain of Covid, officially designated a "variant under monitoring" by the World Health Organisation (WHO) due to its rapid rise.

Seven people in the UK have been diagnosed with the strain, which has the potential to evade immunity from previous infections or vaccines.

Some symptoms are the same as ones associated with previous strains, however medics have confirmed new signs - like heartburn - have been noted too. Gastrointestinal symptoms can include abdominal pain and bloating, doctors added.

NB.1.8.1 is already the dominant strain in Hong Kong and China, and has been detected in Australia, the US and across popular

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