Obligate intracellular pathogens

Definition

Obligate intracellular pathogens are microorganisms that can only replicate and survive within the cells of a host organism. They rely on the host's cellular machinery for essential functions such as energy production and reproduction.

5 Must Know Facts For Your Next Test

1. Examples include viruses, certain bacteria like Chlamydia and Rickettsia, and some protozoa.
2. They evade the host's immune system by residing within cells, making them less susceptible to extracellular defenses.
3. Diagnosis often requires specialized laboratory techniques since they cannot be cultured in standard media.
4. Treatment typically involves antimicrobial agents that can penetrate host cells, such as specific antibiotics or antiviral drugs.
5. Their life cycle includes entry into the host cell, replication using host resources, and eventual exit to infect new cells.

Related terms

Endocytosis:

A process by which cells engulf substances from their external environment.

Antimicrobial Agents:

Substances used to kill or inhibit the growth of microorganisms.

Host Cell: A living cell in which a virus or other microorganism can replicate.