Even if we wash our hands, eating food which has Giardia’s cysts will infect us, am I right?
And if we won’t wash our hands, the cysts will get on our hands but we’re not little children to put our hands in mouth so how is this harmful?
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Well, in this case the obvious answer is the correct one. If you are consuming food or liquid that contains viable giardia cysts, that’s a great way to become sick with giardia. The idea of course being that you are *cooking* your food and boiling or sanitizing your water before you consume it. But you can’t boil your hands. So if you dip a bottle into a stream with cysts, and you sanitize the water, that’s safe to drink. But in doing so you probably got some cysts on your hands so you wash them.
As far as not being a child, have you actually thought about how often people touch their mouth/nose? I remember a study early in COVID that estimated that a person will touch their face, on average, every two minutes. Multiply that by the hours and hours a cyst might remain on your filthy unwashed hands, and you get the idea.
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