Your body does not develop antibiotic resistance; it is the bacteria that become resistant to antibiotics through genetic changes. Generally, antibiotics target bacteria, killing or weakening them, and helping you to fight off infections.

If you get an antibiotic-resistant bacterial infection, the antibiotics usually used to fight it are no longer effective. A less accessible or last resort antibiotic will then need to be used, and in some cases, options for potential active antibiotics could run out. In addition, the antibiotic-resistant bacteria in your body can infect your family and others.

Antibiotic resistance mainly arises from the overuse and misuse of antimicrobial drugs. Patients get antibiotics from their doctors, buy them over the counter, or, in some cases, consume them wrongly (e.g., by taking antibiotics when having a viral, rather than a bacterial infection). Antibiotics are also used in farming and spread into the environment. Poor community control of antibiotics use, and the growth of drug-resistant infections may leave us without any effective treatment.[1]

Check out these videos about Drug-resistant infections: 

References

1 WHO. (2015). Worldwide country situation analysis: Response to antimicrobial resistance. www.who.int. ISBN 978 92 4 156494 6