What Is Rickettsia.

What Is Rickettsia?

Rickettsia are bacteria, which are obligate intracellular parasites many disease-causing, that prevail in vertebrates and are transmitted by bloodsucking epenthetic arthropods such as fleas , lice and ticks. Rickettsias are named after their discoverer, the American diagnostician Harold Taylor Ricketts, who died of typhus in Mexico after confirming the infectious promoter of that rickettsial disease.

Rickettsias unlike other bacteria, but like viruses, they petition a living host (a living cell) to survive. Rickettsias from infected vertebrates, ordinarily mammals, live and multiply in the gastrointestinal tract of an arthropod aircraft carrier but do not cause disease thither; they are transmitted to some other vertebrate, possibly one of another species, by the arthropods mouthparts or faeces.

The cells are extremely small (0.25 um in diameter) rod-shaped, cocci and often pleomorphic microorganisms which have typical bacterial cell walls, no flagella (except for Rickettsiae prowazekii), are gram-negative and multiply via binary program fission only inside host cells. They occur singly, in pairs, or in strands.

Rickettsia and its Diseases

Organism and diseases

Rickettsia

species Disease Natural cycleb Geographic distribution

Vectors Hosts

Typhus chemical pigeonholing:

Rickettsia prowazekii Epidemic typhus Human body liceHumans Worldwide

Recrudescent typhus none Humans Worldwide

Lice, fleas Flying squirrels Eastern USA

R. typhi Murine typhus Fleas Rodents Worldwide

Fleas Opossums USA

R. genus Felis Murine typhus like Fleas Opossums USA

Spotted Fever group:

R.



rickettsiae gravelly Mountain spotted fever Ticks Small mammals, dogs, rabbits, birdsNorth & southern America

R. conorii Boutonneuse fever Ticks Rodents, dogs Africa, Southern Europe, India

R. sibirica North Asia tick typhusTicks Rodents Eurasia, Asia

R. japonica Japanese spotted fever TicksRodents, dogs Japan

R. australis Queensland tick typhus Ticks Rodents Australia

R. akari Rickettsialpox Mites House mice, rats Worldwide

Ehrlichioses group:

Ehrlichia chaffeensis Human monocytic ehrlichiosis TicksHumans, deer USA, Europe

Ehrlichia Sp Human granulocytic ehrlichiosis Ticks Humans, deer, rodentsUSA, Europe

Others:...

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