Sombreroman It would be interesting if the bacteria (although it would be more interesting if it were a parasite) had the ability to "take" the DNA of the hosts and use them to improve the bacteria itself.
What I mean, for example, if the bacteria infected a bird, it would get access to mutations like developing wings on the host.
Or the bacteria simply had different mutations that would develop different types of infected, for example an infected with a large shell layer to withstand bullets, etc.
I hope you liked my ideas 😉