Bacteria undergo genetic mutations at a much quicker rate than humans. Often this will prove fatal to the mutated bacteria, but since bacteria are so plentiful, and since they reproduce so quickly, this poses no threat to the overall bacteria populations.
Every once in a while, just by chance, one of these genetic mutations causes the bacteria to become resistant to a particular antibiotic. For example, a bacteria's DNA may mutate and begin producing a chemical which inactivates penicillin.
Now imagine that the mutated bacteria finds its way into a human host. When the human realizes she is sick and begins taking penicillin, all of the non-mutated bacteria cells are killed, leaving only the mutant bacteria to thrive. It can reproduce without risk from the penicillin, and in short order the patient has an infection consisting ENTIRELY of mutated, penicillin resistant bacteria. The patient can then spread the infection to others, and penicillin will prove useless to combat the illness.
In short, it is the frequent genetic mutation, large bacteria population, and short reproductive time which allows such quick resistance to develop.
They become immune as tge usage of antibiotics occurs
That's not evolution. That's an adaptation.
The development of resistance to antibiotics by bacteria is a real world example of evolution.
The process is called "evolution". Basically, if one bacterium has a trait that helps it resist antibiotics, it is more likely to survive and reproduce.
Bacteria become resitant to antibiotics by evolution .
NO! Antibiotics have no effect at all on viruses and should never be used to treat viral infections and doing so accelerates the evolution of antibiotic resistance in bacteria.
It is when a certain bacteria resists a drug such as antibiotics
They have resistance to the antibiotic.
B- Bacteria
They develop resistance to antibiotics .
Resistant or resistance is when a bacteria has adapted to an antibiotic.
when two different antibiotics are taken simultaneously againt multi bacterial infections cross resistance in the bacteria results
Some bacteria strains may acquire resistance to antibiotics and/or cause a new disease by gaining spores from other bacteria.
Bacteria, like all organisms, have phenotypic variations. Some bacteria are resistant to antibacterial drugs and survive the onslaught of these drugs. They then go on to have progeny ( by fission ) that they confer this resistance on so that you have a new population of resistant bacteria.