Here’s a very interesting article in Space.com. I remember reading the Andromeda Strain back in the day, great book. Although the story is a bit dated by today’s standards, it does give us a cautionary reminder of what could happen if isolation procedures are not kept.
If you’ve watched the more recent, and brilliant, Apollo 11 documentary film, you would have noticed that the three crew were put into isolation for 30 days (I think). I always thought that this was a bit extreme… not anymore.

More here.