I agree with the above. We've become paranoid about germs. Almost every day someone is telling us how many germs there are on a dishcloth or whatever, but these scare statistics are never put into any proper context. Germs are everywhere, in enormous quantities, and animals (including us) have evolved complex immune systems to protect us from them. Our immune systems need regular exposure to infectious organisms to maintain their strength, and without this exposure our immune systems get weaker.
Of course, very high levels of exposure can overwhelm our immune systems, and then we get sick. So as with most things in life, moderation is the keyword. We need to keep our environments reasonably clean, but definitely not sterile.
I shall continue to use my bags for life with no worries.