As most bacteria evolve to a less deatly version of itself to promote spreading, why hasn’t TB evolved to a more harmless bacteria? It’s so old, so there was plenty of time. Killing the host seems pointless in a evolutionary sense.
Im not sure your original supposition is in fact correct. What you are seeing is a constant competition between organisations rather than a rule of evolution.
Im not an expert. Id appreciate those with specific evolutionary theory / knowledge add to the conversation.
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