Abstract
Bacteria do not live alone. They crowd together and form tiny “neighborhoods.” In these neighborhoods, some bacteria can resist antibiotics. They break down the medicine and create “safe zones.” They then protect their sensitive neighbors.
We mixed resistant and sensitive bacteria. Then we watched how they grew on plates with different amounts of antibiotics. The two types of bacteria formed many different patterns. Sometimes the resistant ones took over. Other times, the sensitive ones used the safe zones to survive.
We also grew the same bacteria in liquid. We found that the same kind of safe zones do not exist in liquid. Instead, the cultures either grew rapidly or died.
Our study shows that bacterial survival does not depend on one cell alone. It depends on the whole neighborhood around it.
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