I'm new here. About 2 mths ago a neighbor came across 4 four day old kittens in a rural community. They were inside a monument sign he was wiring at a new shopping center. He contacted me and asked what he should do with them since the temp inside the metal sign was about 85 degrees. He brought them to me, even though the mother may have returned. My reasoning was there would be 4 less feral cats living a hard life and reproducing. I am happy to say all 4 survived with no medical issues. They are now about 9 wks old. They just received their second combo shot and were tested for FIV/FeLk. One of the 4 tested faint positive for FeLk, all were FIV neg. This was the in office test. I was advised to separate 2/2, which was fine because 2 were going to be my daughters pets and I was keeping 2. The little girl that tested positive is with me. I have 3 other older cats that were vaccinated many years ago, but are all FIV/FeLk negative. I have done my best to keep the two little ones from eating, drinking or using the same litter box as the older cats. I was advised by the vet to bring them all in for a retest in 30 days. My questions are: Is it common for 1 sibling to be positive and the others negative? Should I seek out another vet that would be willing to do the more extensive test prior to the 30 days to determine if my little girl really is positive? I am heartbroken that my sweet little girl might have this dreaded disease. I will not euthanize, as I know they can live a relatively happy healthy life even with the virus. My concern is merging them into my home with my adult cats. The vet I am using is a low cost spay/neuter vet with minimal care. I chose this vet because I wanted to have all of them spayed/neutered prior to them going to any homes and I was looking for an economical means of doing that. I am fortifying my little ones with L-lysine and high quality dry and canned food. Any advice or help that anyone can offer would be greatly appreciated. Thank you.