The Queen opted to wear long white gloves as she carried out an investiture at Buckingham Palace.
The palace declined to confirm whether the 93-year-old monarch was taking the precaution because of the coronavirus outbreak.
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But the number of people diagnosed with Covid-19 in the UK has risen to 51, and the head of the World Health Organisation has advised people over the age of 60 to avoid crowded areas.
A royal source said the Queen would be following any advice from the Government.