The Queen has thanked healthcare workers for their "selfless commitment and diligence" in a message to mark World Health Day.
The monarch praised "those in the healthcare profession" for undertaking "vitally important roles to protect and improve the health and well-being of people across the Commonwealth, and across the world."
Watch the Queen's address to the nation in full:
In a statement, the 93-year-old said: "In testing times, we often observe that the best of the human spirit comes to the fore; the dedication to service of countless nurses, midwives and other health workers, in these most challenging of circumstances, is an example to us all.
She added: "My family and I send our enduring appreciation and good wishes."
Both the Queen and the Duke of Edinburgh are staying in Windsor during the Covid-19 pandemic and are in contact with the smallest number of staff as possible.
The Royal family have been affected by the outbreak. Prince Charles spent time in self-isolation having contracted the virus, but has since made a full recovery.
The heir to the throne has also issued messages of support during the pandemic, praising medical staff as "the backbone of our remarkable NHS" in a video message.
The Duchess of Cornwall also completed 14-days of self-isolation despite testing negative for the virus. The couple were reunited on Monday.