Of 64 patients meeting the CDC criteria before October 29 , 80 % had had a preceding respiratory illness .
75 % reported fever in the days leading up to limb weakness , the onset of which was generally abrupt .
Of 64 patients meeting the CDC criteria before October 29 , 80 % had had a preceding respiratory illness and 75 % reported fever in the days leading up to limb weakness , the onset of which was generally abrupt .