Which infection is caused by microorganisms present in sufficient numbers?

The correct choice indicates that a systemic infection is caused by microorganisms present in sufficient numbers. A systemic infection occurs when pathogens invade the body, multiply, and spread throughout the bloodstream, affecting multiple organ systems or the entire body. This wide-ranging spread can lead to various complications and can be especially dangerous, as it may overwhelm the immune system.

In contrast, other types of infections are more localized in nature. A localized infection typically remains confined to a specific area of the body, such as a cut infected with bacteria, where the microorganisms do not spread throughout the body. Chronic infections, on the other hand, can persist over an extended period but may not be due to high numbers of microorganisms at any one time. Acute infections are often characterized by a sudden onset and typically involve a rapid increase in microbial numbers, but the fundamental feature distinguishing systemic infection is the widespread dissemination throughout the body’s systems.