So my knowledge is limited but I’ll explain it as best as I understood it and hopefully get it mostly right.
Basically, there’s a lot of bacteria inside our bodies at all times and for the most part it’s actually good for us. When you take antibiotics, those drugs don’t see a difference between good and bad bacteria – they just kill it all. Without the healthy bacteria in our system keeping it in check, a C diff infection can actually grow far more easily.
Hopefully someone who knows more can explain it better.
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