Have been on famvir about 4 weeks now, but had a lymphocyte subset done 1 week after being on famvir, have had similar tests done pre famvir too. Quick history, previous infections to ebv, cmv, chickenpox 6 years ago which started the cfs ball rolling. In australia I cant get ebv/cmv titre values measured or so Im told. So what my dr is working off is my lymphocytes test results, which are always elevated and dr thinks its ebv reactivation. Any way famvir has improved my brain fog, and steady my energy levels, not so up and down, but my sleep quality although improved is not long enough and is back to front, awake all night and sleep during the day eg 8am-1pm. Second week on famvir my aches and pains increased but now have decreased. So getting something out of it, fingers crossed. Saw dr today for results of blood test and all my lymphocyte subsets are increased as well as total lymphocyte count. He suggested its probably stirred things up and because we are seeing some improvement to keep going with the famvir and test lymphocytes again in a couple of months. Looking for feed back from anyone who has had similar results or can comment on the increase in lymphocytes for AV treatment.