Blake ran 100m in 9.69 this evening. (WR is 9.63)
Interviewed afterwards, he said "I've been fighting off 'flu all week."
DH thinks I am being unreasonable to scoff and sneer and invoke the concept of manflu. Apparently "people can have 'flu and not know they have got it." 
I maintain that if you have Influenza you cannot get up the stairs to the khazi without thinking you are going to die.