"Patrick" - while you're all in study hall today, think about all of those mass campouts that the Cub/Boy Scouts have held over the years. Especially the ones before such neat innovations as baby wipes, waterless hand cleansers, etc. Even though micro-gravity isn't an issue, I don't think sanitation at those events would have met your approval, either. Yet, I don't think I've ever heard of mass infection coming from those events...
BTW, I have a daughter that, due to corrective hip-surgery, wound up in a spica cast for a total of about six months over two procedures. I'm not talking infant, but in 8- and 12-years of age range. The Apollo astronauts got nothing on me or my ex-wife, not to mention the indignities my daughter had to suffer. BTW, since I assume he knew we were competent adults, one of top orthopedic surgeons in the country, a professor at Northwestern University (and a pretty good guy), never once told us to wash our hands. Nor did his staff. Nor do I recall the nursing staff at Children's Memorial in Chicago feeling it necessary to do so. Mind you, most of the time in her casts was at home, not the hospital.*
You guys, "Patrick", on the other hand, probably would have insisted that her physical therapy, while she was in her casts, be done by us and her PT while wearing bio-hazard suits, given your absolute phobia.
In other words, to quote Jack, "You got nothin'!"
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*OTH, I did live in horror at the idea of a fire in the house during the night while she was in her casts.