Depends what you mean by "created in our body by our body." Your body begins with a single human cell, then divides and grows. All those cells have your human

Depends what you mean by "created in our body by our body." Your body begins with a single human cell, then divides and grows. All those cells have your human DNA. But at some point bacterial cells also appear as part of your body, for example in your digestive tract, playing important roles you can't live without. Their source is not from your human cells, but they still form part of your body as a whole, in a sense.