Scientists have made a groundbreaking discovery about antibiotic resistance in bacteria, revealing a "secret switch" that allows them to evade detection. The phenomenon, known as heteroresistance, has been observed in various species of bacteria and can lead to delayed treatment and worsening of illnesses.

Source: https://www.livescience.com/health/medicine-drugs/scientists-have-found-a-secret-switch-that-lets-bacteria-resist-antibiotics-and-it-s-been-evading-lab-tests-for-decades