Thanks franknbeans, that explains why I was having trouble finding results that told me anything. I guess I was too tired after volunteering to read properly.
From what I understand, there is technically a vaccine called Chinese Live Attenuated EIA vaccine, but it seems it's only available in China. According to an article I was reading, 63 million horses in China have been vaccinated. Most other articles were from the late 1990s so I didn't read them much. I also came across an article about a horse named Nora who was supposedly naturally immune to EIA. I couldn't find articles newer than 2010, but the state was trying to have her destroyed because she lived in an EIA facility.
I found that there was a reported outbreak in western Canada in August of last year. Not sure what happened exactly though.
I figured it wasn't much of a big deal as far as general exposure, but it's scary to think about dealing with. I think when I start looking for a horse, I will call the state vet in Lakewood (Colorado). I'm going to be one of those ultra-paranoid helicopter owners (constantly hovering).