Next time that you are at a Dr Office/Hospital/etc watch what they touch after touching you… They will usually wash their hands/don gloves before starting, but… There is rarely a change of gloves or washing of hands after touching the patient – they go on to type in their laptop; handle equipment; etc. Sometimes they then come back to touch you again. Your cooties just were transferred to stuff and the cooties of everybody before you were transferred to you.
I have worked in laboratories with unsealed radioactive material – when you can easily detect a few pico-grams of contamination, one learns really fast how to minimize the spread of contamination. The hands are the root of all evil when it comes to contamination control – it seems excessive, but changing gloves every time that you touch something that is potentially contaminated is the only way to really minimize the chance of spreading nasty stuff.
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