There are *a ton* of different types of bacteria all over and inside of everything.
When you get an infected cut, that is some microbe trying to eat/live inside of you and your body is fighting back.
Antibiotics are chemicals that disrupt bacteria’s ability to function but let your own cells go on normally. These help your body fight the infection.
However, there are other bacteria that are not only not harmful, but are actually important to the functioning of your body. For example, your intestines host bacteria that help break your food down.
Antibiotics will kill these guys, too. This is why people often say to take probiotics (basically things that are full of a lot of these helpful bacteria) after a round of antibiotics that likely killed most of them off.
How is it good to have friends but bad to run into a group of criminals?
Not all bacteria are bad, in fact many are instrumental to our gut and skin health (and almost certainly more). When you have a florid infection with bad bacteria (e.g. pneumonia) it’s beneficial to take something that kills that type of bacteria. You will almost always have some collateral damage and kill some of the good bacteria too, which is why diarrhea is such a common side effect of antibiotics.
Your body tends to tolerate good bacteria and so they will repopulate the way they’re supposed to after exposure to antibiotics. Probiotics can speed up and/or maintain this process.
You are fundamentally misunderstanding the english language here. There is no such thing as a “biotic”. Biotic is a description for a thing that relates to a living organism, primarily bacteria. So antibiotics, probiotics, prebiotics, and any other -biotics all different things that are unrelated to each other except that they all interact with bacteria in some way.
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