im looking for the name of a horse disease.?

the disease that i am looking for was going on in mexico around the years 1989 to 1990. i dont know what is is called but teh name of it is a long name. some of the symtoms are your whole skin turns black, you cant eat on your own you cant talk and your whole body hurts. it is also hard to survive and live and get past this disease.
thank you if you know what im talking about. i just need the name of it.

dolphin32122011-03-23T15:16:06Z

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it might have been venezuelan equine encephalitis, not possitive though, sry