http://www.addictinginfo.org/2015/01/24/destroy-anti-vaxxers-arguments/
In the modern world, it’s a rare day that we don’t share the air with
strangers, that we don’t touch the same doorknobs and handle the same
money. Most days, there’s no problem. In fact, being exposed to
strangers’ germs helps us boost our own immune systems, but on an
average of about once or twice a year, either a stranger or someone we
know passes a virus our way.
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