Harvard studies the effects of hand sanitizers. The Harvard Medical School study reveals that hand sanitizers prevent the spread of various gastrointestinal diseases.   The CDC recommends the use of hand sanitizers in the classroom. Please see the CDC page on influenza for more information.   Germs: They're Everywhere Disgusted by Port-A-Potties? Freaked out by fast-food restrooms? Believe it or not, picnic tables and ATMs harbor more germs.   Hand Hygiene Guidelines Fact Sheet Improved adherence to hand hygiene (i.e. hand washing or use ofalcohol-based hand rubs) has been shown to... reduce overall infection rates...