Just found this:
“FeLV is specific to members of the cat family and does not pose a risk to other species of animals or people.”
On
http://www.vcahospitals.com/main/pet-health-information/article/animal-health/feline-leukemia-virus-disease-complex/106
Please don’t agitate yourself. You’re doing exactly what I would do, try to figure out how I could’ve prevented it. You’ve had enough heartache and are doing what you can to protect your other cats. Try to pray and find some peace in the calm moments ;)