horses bite. Dogs bite. Cats bite. Hampsters bite. Lizards bite, some kids bite.
If youve been afraid of horses for 12 years, you have greater issues than the possibility that that one horse was rabid. Being someone who struggles with long term depression and anxiety, I mean that in the best of ways possible. You should talk to your doctor about options, and once that's done, go volunteer at a therapy barn or rescue. Then instead of pointless fear, you may accomplish something for yourself, and further your love of animals.
Also, a standard biology course or two would be very enjoyable to you, and may help assauge (sp?) some of your fears regarding things like diseases and standard animal behavior. Ita at least a good place to start.
I am going to take what you said into consideration. I have even been thinking of going back to the ranch and go horseback riding again after I recover from this. Sometimes it feels hopeless and I feel guilty because I have been waiting months to go to that class trip and now I regret ever going there. Keep thinking if I didn't go I would have still had the love for horses and save myself from years of psychological post traumatic stress torture.