Hi Brandon
You are correct about ETS being a carrier of ranavirus. I don't know much about the disease, but here is a site that has some current information
2011 Ranavirus Symposium

In February, I will be attending a meeting to discuss amphibian conservation in the great plains states. If I get any info on ranavirus, I will post it. IMHO, I wouldn't be too concerned about it. Your tiger is awesome!