genus rickettsia
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Definition
Noun: 1. A genus of bacteria: A taxonomic category (genus) of small, rod-shaped, or coccoid bacteria. These bacteria are obligate intracellular parasites, meaning they can only live and reproduce inside the cells of a host organism. 2. Pathogenic microorganisms: Members of this genus are notable for being the causative agents of several significant vector-borne diseases in humans. They are primarily transmitted by arthropods such as ticks, lice, fleas, and mites.
Usage Examples
- Noun:
- The bacterium Rickettsia rickettsii, a member of the genus Rickettsia, is responsible for Rocky Mountain spotted fever.
- Scientists study the genus Rickettsia to understand how these pathogens evade the human immune system.
- Diagnosis of diseases caused by the genus Rickettsia often requires specialized laboratory tests.
Advanced Usage
- Taxonomic Context: In scientific writing, the name is often italicized () when referring to the genus, and the first letter is capitalized. When used as a common noun (e.g., "a rickettsia"), it is not italicized and is often lowercased, referring to any bacterium within the genus.
- The Rickettsia were observed inside the host cell. (Referring to the genus)
- This disease is caused by a rickettsia. (Referring to a type of bacterium)
Variants and Related Words
- Rickettsial (adj): Of or relating to bacteria of the genus .
- The patient was treated for a rickettsial infection.
- Rickettsiosis (n): Any disease caused by bacteria of the genus .
- Typhus is a form of rickettsiosis.
Synonyms
- Rickettsiae (n, plural): A common term for bacteria belonging to this genus.
- Obligate intracellular bacterium: A descriptive term for its biological characteristic.
Related Terms and Context
- Vector-borne pathogen: A key descriptive phrase, as organisms in the genus Rickettsia are spread by vectors.
- Typhus group / Spotted fever group: Clinical and taxonomic classifications for diseases and species within the genus, such as (epidemic typhus) and (Rocky Mountain spotted fever).
Noun
- can cause typhus and Rocky Mountain spotted fever in humans