my natural killer cell numbers cd56 are within normal range but cd3 which i believe is also an nk cell has always been high, never had cd57 done, my nk function test which was performed by a university cfs study showed my nk bright cell function to be low. Most of my other lymphocytes especially cd8 have remained high (cd3 as well)although have come down with av's and cycloferon. I have been told elevated cd8 can be due to ebv and cmv, but read an article recently saying that cfs patients have low cd lymphocytes??? I dont know if i agree with low, maybe either low or high, both low/high show that our immune system is fighting something. I havent been tested for xmrv yet, maybe i dont have xmrv but fit into dr lerners herpes viral infected sub group, time will tell.