JIS = Japanese Industrial Standard
ISO = International Standards Organisation
Campag = more or less ISO
Far Eastern manufacturers use JIS by default and Western manufacturers generally churn out ISO taper BB; however, there is nothing to stop them making BB to either standard, but this is the "norm".
I've read that Campagnolo used their own standard but I couldn't confirm this: either way an ISO taper does the job.
The thread and taper aren't dependant on each other but, bearing in mind the above, the majority of Italian threaded BB will be ISO taper.
According to Sheldon Brown
, you can mix and match JIS and ISO cranks and BB, but it will affect the chainline and damage will occur when the cranks are removed.