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Keisha Buchanan is the third Sugababe to be struck down with illness.
The singer, 24, told her Twitter followers she's been feeling unwell.
‘Blocked nose, head hurts, my back is aching and the house is hot but I'm under my duvet in a thick jumper freezing,’ she writes.
Keisha’s bandmates Heidi Range, 26, and Amelle Berrabah, 25, were diagnosed with severe flu last week.
But the star says people shouldn't jump to conclusions about her symptoms.
'Don't read into it as anything!,' she adds. 'It might be a case of food poisoning.'
The Sugababes's plans to promote their comeback single Get Sexy are on hold.
SEE PICTURES Celebrity swine flu>>