Brown died on Christmas Day, aged 73, after being admitted to hospital with severe pneumonia.
When she subsequently met the child at a Malawi orphanage, she was told he had survived malaria and tuberculosis but still had severe pneumonia.
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The WHO says information about it is still limited, but that all the victims have had severe pneumonia, with symptoms including a fever and shortness of breath.
Symptoms include fever and respiratory problems, including severe pneumonia.
There was a series of severe cases of pneumonia in Jordan earlier in the year.
In one in 15 cases it can lead to severe complications such as pneumonia and inflammation of the brain.
But symptoms, which include fever and a cough, are severe and can lead to pneumonia and kidney failure.
But symptoms are severe and can lead to pneumonia and even kidney failure.
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In one in 15 cases it can lead to severe complications, such as pneumonia and inflammation of the brain, and can be fatal.
Since she reportedly never contracted chicken pox as a child, she was at higher risk for developing severe symptoms and complications including pneumonia.
These include a severe cough and breathing difficulties, ear infections, pneumonia and eye infections.
Severe cases could see vomiting and diarrhoea or develop into pneumonia.
It will also report the percentage of residents at any particular nursing home who claim to have severe or moderate pain, the percent who have received a pneumonia vaccine, and the percentage who have been physically restrained.
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