She spoke to staff who had to cope with the large influx of Covid patients.
Britain's Queen Elizabeth's spoken candidly about getting coronavirus - saying it left her feeling "very tired and exhausted."
She tested positive for Covid in February and missed a number of engagements.
The 95-year-old Monarch was on a virtual tour of the Royal London Hospital to mark the official opening of a new unit.
She spoke to staff who had to cope with the large influx of Covid patients.