Just a thought: Maybe you are picking up those bugs in inconspicuous places such as : the phones, after you have washed your hands.... Remember, just because you washed your hands, doesn't mean the nurse or aide before you did.... I make sure to not touch my lips to the phone receiver and if I use a dedicated phone, use a antiseptic wipe on it first thing your shift.... I don't get ill much, also use alot of the PURELL hand sanitizer. GOOD LUCK