A pet owner's primary source of information concerning their pet's health and well being should be their veterinarian. The information provided here is not a substitute for veterinary care. In all matters pertaining to the care and treatment of a pet a veterinarian must always be consulted first.  

There are many online resources including discussion groups. One of the most popular health related groups  is fanciershealth.

A popular Aby specific group is Abys-List

Here are some additional feline health websites: 

Cornell Feline Health Center