The Queen has thanked healthcare workers for their "selfless commitment and dedication" as they risk their lives to help people suffering with coronavirus Covid-19.
The Monarch released the message to mark World Health Day, saying nurses, midwives and other health workers working through this uncertain time are "are example to us all".
Speaking on behalf of the Royal Family, she sent her "enduring appreciation and good wishes."
In a new statement, she said: "On the occasion of World Health Day, I want to thank all those in the healthcare profession for your selfless commitment and diligence as you undertake vitally important roles to protect and improve the health and well-being of people across the Commonwealth, and across the world.
"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.
"My family and I send our enduring appreciation and good wishes."
On Sunday, the Queen gave a moving national address on the worldwide health crisis, telling people across the country "we will meet again".
She delivered her message in Windsor Castle's White Drawing Room, with just one camera operator who was dressed in full protective equipment.
She praised the NHS and other key workers for all they are doing at this difficult time, and thanked people who are staying home and not seeing their loved ones in a bid to stop the spread.
She said that she hopes people will all look back at the crisis and "take pride in how they responded to this challenge".
Speaking about the "pain" many are feeling at being away from the people they love, she reflected on meeting evacuated children during the war.
Her message was widely praised, with many saying it was exactly what the country needed.
Before the recording the Queen sought her personal doctors' advice, which was strictly followed to mitigate any risk to the monarch or others at the castle.
Sources with knowledge of the recording suggested the logistics and planning had been made “particularly difficult” due to the nationwide lockdown and fears over the risks to the Queen’s health after she entered isolation on government advice.
The Queen wrote the speech with the help of her private secretary Sir Edward Young, who is one of her most trusted aides.
A source said: "Her Majesty wanted to make particular reference to her very first broadcast in 1940, when she was just a young girl who had been evacuated from Buckingham Palace as Nazi bombs rained down on London.
"The Queen must have felt it quite pertinant that the coronavirus crisis, which has kept so many away from their family and friends, had drawn parallels with her own experience of living through the war as an evacuee."
She worked closely with Number 10 on her speech, and care was taken to ensure the timing of her important message was right.
A royal source said: “Throughout the process senior royal aides liaised with Number 10 who were delighted the Queen had struck the perfect tone in her address.”
