Final answer:
Transient bacteria are the types of drug-resistant bacteria that do not typically persist in the gut as part of the intestinal microbiota.
Step-by-step explanation:
The types of drug-resistant bacteria that do not typically persist as members of the intestinal microbiota are transient bacteria. These bacteria are not usual inhabitants of the gut and do not normally reside there for long periods. Instead, they may be introduced into the system and temporarily colonize the gut before being outcompeted by the resident bacteria or eliminated from the body. In contrast, commensal bacteria are normal components of the microbiota, reservoir bacteria are those that can maintain and spread resistance within the microbiota, and opportunistic pathogens are normally harmless microbes that can cause disease when the host's defenses are compromised.
Healthy people live in harmony with most of the microorganisms that establish themselves on or in (colonize) nonsterile parts of the body, such as the skin, nose, mouth, throat, large intestine, and vagina. The microorganisms that usually occupy a particular body site are called the resident flora. Cells of the resident flora outnumber a person's own cells 10 to 1. Microorganisms that colonize people for hours to weeks but do not establish themselves permanently are called transient flora.
The resident flora at each site includes several different types of microorganisms. Some sites are normally colonized by several hundred different types of microorganisms. Environmental factors, such as diet, antibiotic use, sanitary conditions, air pollution, and hygienic habits, influence what species make up a person’s resident flora. If temporarily disturbed (for example, by washing the skin or using antibiotics), the resident flora usually promptly reestablishes itself.