This paper discusses evolutionary models of antibiotic resistance. Antibiotics are defined as drugs that fight infections (CancerWEB's On-line Medical Dictionary 1998). An infection, in turn, is the invasion and multiplication of harmful microorganisms in the body, whether in one place (localized), temporary, persisting, extensive or systemic, depending on the body's resistance and tolerance. Infection is one of the causes of disease, a condition, which is characterized by identifiable group of signs and symptoms (Lexico Publishing Group, LLC 2003). Antibiotics are effective only against infections caused by bacteria, a class or kind of microorganisms.
