I was diagnosed with IM twice - first in 8th grade and then again a couple of years later. But Mycoplasma Pneumonia four years ago (at age 62) was the infection from which I haven't recovered.
Ditto for me, IM once in high school and then again as a senior in college. Also had pneumonia twice, once in high school and then again when I was 25. Roller coaster ride of good/poor health for a couple decades and then hit with full blown CFS after a pneumonia-like respiratory infection at age 42.