I have started asking some people that I know what virus caused the auto immune response that caused T1. I've been hearing a lot of odd ones.
I have heard of Varicella( chicken pox) and Herpes simplex 1 or 2.
I had the standard and most common Coxsackie B.
Most people I ask don't know because it was not tested or the virus was gone by the time they were diagnosed.
I don't even know if it is even used anymore. I think they tested me because I was already 20 when I was diagnosed and perhaps it was how they determined I was type1 even though I was a beanpole at the time.
I fail to see the need for it more than a curiosity or in understanding the process in order to prevent it.