This isnt answering your question regarding autism, but Jesse is immunised and i wouldnt hesitate with any future children.. for 2 reasons that i read in M&B and totally agree on..
1. giving them the needles they are less likely to catch that desease if there are any cases in the community,
and 2. If enough people are immunised the infection can no longer be spread, so the disease will die out altogether. This is why smallpox has been eliminated.

This is another one of those personal choice subjest though..