Kate, 42, who finished chemotherapy in the summer, took a leading role in greeting Sheikh Tamim bin Hamad AI Thani and the first of his three wives, Sheikha Jawaher, on their two-day state visit to the UK.
Meanwhile a stoic Camilla, 77, who had a private lunch with the Qatari couple, revealed the chest infection she was battling was pneumonia.
On the advice of her doctors, she pulled out of yesterday's chilly open-air Whitehall welcome.
Charles, 76, who has also been treated for cancer, braved the 6C temperature to greet the guests at the royal dais along with PM Sir Keir Starmer, Foreign Secretary David Lammy and Home Secretary Yvette Cooper.
It is understood the Queen's had the less severe viral type, not bacterial, and has cleared up.
However, she is now facing bouts of extreme tiredness.
Camilla, first diagnosed with the bug after her trip to Australia and Samoa last month, has reduced her diary on her medics' advice.
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