genetically mutated

Scientists announced recently they’ve developed an antibiotic from a fragment of a protein found in human breast milk, and they believe it could be the solution to drug-resistant superbugs. [1]
Antibiotic resistance threatens to send medicine back to the Dark Ages. Imagine a world in which illnesses that used to be easily treated with antibiotics kill scores of people with impunity. Picture developing an infection after surgery and there is virtually no drug to treat it.

If you think fleas are annoying now, hold onto your collars; experts are warning that the little nuisances are becoming resistant to the popular flea control products that pet owners turn to in order to keep their little buddies itch-free.
Veterinarians are telling pet owners that flea treatments like Advantage and Frontline are a waste of money because they’re no longer effective at getting rid of fleas and keeping them away. The bugs have mutated in order to survive, it seems. [1]