There are approximately the same number of bacterial cells in our bodies as human cells (Sender et al, 2016). These microorganisms help us with many of our own functions and, through billions of years of co-evolution, we have formed a symbiotic relationship. We provide a suitable environment for the bacteria and, in return, they help to process nutrients and many other activities in our bodies. The bacteria undergo constant evolution to further improve their fitness (their ability to grow and reproduce). This has caused a great strain on our healthcare system, as this evolution has led to the spread of harmful things, like antibiotic resistance.
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