The Duke of Edinburgh, 99, will undergo testing and observation for a pre-existing heart condition.

The whereabouts of one infected person is unknown, as they did not give their full contact details.

The study measured infection rates in school staff and pupils in November and December.

The UK has 7.3 critical care beds per 100,000 people, compared to Germany's 33.8 and the US's 34.3.

Harry draws parallels between the treatment of his mother and wife, in teaser clips of a TV special.