(HealthDay News) -- Antibiotic resistance occurs when bacteria change in some way to survive despite a person's use of an antibiotic.
Antibiotics are medications that fight a specific bacterial infection.
Resistance may result when an antibiotic is over-prescribed, when it's inappropriately prescribed for an viral illness (such as the common cold), or if a person stops taking an antibiotic before the entire prescription is used.
The U.S. Centers for Disease Control and Prevention says the dangers of antibiotic resistance include:
Resistant bacteria can be spread to friends, family members and coworkers.
Resistant bacteria can affect entire communities with illnesses that are expensive and difficult to treat.
Resistant infections can target people with weaker immune systems -- such as babies, young children and older adults.
Some infections can be deadly.