You might even exercise extra caution a little longer than that (just my opinion). I would be careful letting him go anyplace other dogs go. A carrier is a good idea, especially when taking one to the vet, so they don't touch anything a sick dog has been in contact with.
There is another thread on YT, where a member has 2 or 3 young pups that got parvo even after being vaccinated. Here is the link:
http://www.yorkietalk.com/forums/sic...ts-hearts.html