From what I have gleaned, any infection, cold, etc. can bring on a bout of CFS. Our immune systems are useless or at least severely compromised so any type of "bug" can cause a relapse and whatever recovery time you think is adequate, double it, just my 2 cents worth.
Craniotomy/Meningioma 12/02,Bi-P. 04,SMI 06, Glu./Wh./La. Int.,IBS 06, Mig. w/ps.-seiz. 07,Dev.Sep.Sur. 9/07, 2nd Men./Tu. Gam. Kn. Rad.12/08, Rad. Hyst. 09/09, w/Meno, Fibro. 09, Disab. 09, EBV/CFS? 11, Vom., D + C w/Vertigo 12, C-diff, spas. col., Chr. Fat. Mod. 13, Lots of Meds they ch. often + herbal meds + alternative when I can afford it.