Bacteria have evaded the attack by

Bacteria have evaded the attack by humans by elaborating various mechanisms of antimicrobial resistance: production of enzymes capable of destroying antibiotics such as beta-lactamases, loss of porins that hamper the move of antibiotics into the bacterium, creation of efflux pumps that essentially eject theantibiotic, modification by gene production of antibiotic binding sites on the bacterial cell wall such as mutation of penicillin-binding proteins