i'm not sure what the question is--but a cat that tests negative when you don't know for sure that the cat hasn't been in contact with a positive cannot be assumed to actually BE negative, because of that same 120-day window.... say you take in a cat that's been exposed in the previous week--might well test negative, but in a month would test positive.... so ALL tests, ideally, should be repeated in 120-days: this hypothetical kitty who got outdoors and mixed with positives could test negative at day 10 of exposure, positive on day 45, and have processed the virus out of its body at the 120-day mark.....
if you want to od on medical terminology, go to scirus.com, and type in "FeLV...." much of the info is way beyond my everyday knowledge, and a lot of the cites that come up are dated--but there's some neat stuff there anyway.... (grabbing medical dictionary and virology text for next period of nothing-better-to-do time....) -- MaryChristine AIM / YAHOO: TenHouseCats MSN: [EMAIL PROTECTED] ICQ: 289856892
