We have a 10 year old female cat already; adopted a male cat 4 years ago who's been missing for 9 months now 
so we decided we would adopt another male kitten.
We were introduced to the most gorgeous little chap 
who's had an awful start to his life (found when he was 7ish weeks old & needed an op) and have been visiting him at the Animal Centre for the past 2 weeks. We have been speaking to the staff at the centre and asking when we could take him home, understanding of course that his stitches would need to be removed first. Agreed (verbally) with them that he "should" be ok to come home with us after his vet check and first injection, on the understanding that we'd take him back for his second injection and to be neutered and microchipped - absolutely we would, all fine.
He's now had his first injection and the stitches removed - all fine. He's also had a test for feline aids/leukemia which came back clear, so we were hoping to take him home today/this week. However, RSPCA called me to say Vet was concerned re the feline aids test, and that we wouldn't be able to take the kitten home until he'd been re-tested in 3 weeks ... so we have to wait 3 weeks before we find out if we can actually adopt him.
My question is - why would the vet think that there might be a chance of him having the feline aids/leukemia after the first test came back negative? We obviously understand that they can't rehome him to us because we already have a cat, but it's now got me worrying that the vet thinks the kitten has a high risk of having the disease!
Sorry for the long-winded post, didn't want to miss anything out! Sooo hoping we can give this wee fella his forever home!