It would seem some species of bacteria have developed yet another defense against anti-antibiotics. Evolution in action, only against us.

>>For such simple organisms, bacteria are surprisingly crafty when it comes to defending themselves from antibiotics. They build biofilms to protect colonies, hibernate until the danger passes, and of course they’re steadily evolving genetic resistance to our best drugs. Now researchers at Princeton and California State University-Northridge have discovered a new bacterial defense mechanism, where dying bugs will “hoard” antibiotics to allow their neighbors to grow unharmed.<<

https://newatlas.com/bacteria-self-sacrifice-antibiotics/58348/