All this cleaning reminds me of the recent article about allergies and too clean houses -
http://www.webmd.com/allergies/news/20140606/too-clean-homes-may-encourage-child-allergies-asthma-study
"The findings support the "hygiene hypothesis," which holds that children in overly clean houses are more apt to suffer allergies because their bodies don't have the opportunity to develop appropriate responses to allergens, said Dr. Todd Mahr, an allergist-immunologist in La Crosse, Wis., and chair of the American Academy of Pediatrics' Section on Allergy & Immunology."
I don't put cooked meat on a plate where raw meat was and definitely wash a knife if I used it to cut meat and want to now cut veggies but definitely not to the extreme of some of the PPs.