I'm so sorry for your loss.
I know that this is an extremely difficult time for you now, with so much uncertainty hanging in the air. But please try not to beat yourself up over past "mistakes". It actually sounds to me that you acted pretty responsibly. You had him tested at the same time that he was neutered, and the test result was negative. You had the rest of the cats updated last year, and they were always negative. You had no reason to think that anything additional was necessary. What more could you do?
Sending lots of that all of the rechecks come back negative.
I know that this is an extremely difficult time for you now, with so much uncertainty hanging in the air. But please try not to beat yourself up over past "mistakes". It actually sounds to me that you acted pretty responsibly. You had him tested at the same time that he was neutered, and the test result was negative. You had the rest of the cats updated last year, and they were always negative. You had no reason to think that anything additional was necessary. What more could you do?
Sending lots of that all of the rechecks come back negative.