Johnny Weir did a webcast in which he said he was suffering from undiagnosed mono during the Olympics and Worlds. He was only diagnosed when he woke up with severe swollen glands while on the COI tour. He saw a doctor who told him he had mono and most likely had it for quite awhile. The link to the webcast is hopefully posted below.
http://www.wfsreport.com/
http://www.wfsreport.com/