Oh well.
Here's what I'd suggest:
If you are a germaphobe, then you would probably want to run some Citric Acid or good Dishwasher Cleaner through the dishwasher every month or so on the longest, hottest possible cycle (surely these creatures can't survive 158F/70ºC + for over 1hr on todays machines!), with the Sanitise option selected if you have one (i.e. Potscrubber cycle with Sani on).
During the Rinsing phase, I would then add a good, strong dose of Vinegar or dishwasher/washer descalers to help get rid of anything left over.
Following the wash cycle, you could also wipe down the seal with a bleach laden cloth - Yes, I know its rubber, but you can add some Vaseline to it later on to keep it greased (and sealed).
That, or if you have a Steam dishwasher (Thermador comes to mind...), run it on the longest steam cycle possible.
Vwalah!