Typhus caused Rickettsia prowazekii, it could be argued, has undergone a recent host and vector shift...
Typhus caused Rickettsia prowazekii, it could be argued, has undergone a recent host and vector shift (to humans and lice, respectively) - what evidence is there for this?
Homework Answers
- Rickettsia prowazekii is a gram negative, intracellular bacterium.
- Rickettsia spp. causes epidemic typhus.
- Arthropod vectors primarily cause transmission of this disease typhus.
- Mainly the strains of Rickettsia prowazekii could be observed in humans and in squirrels.
- The only reservoir for Rickettsia prowazekii is humans.
- Head louse, in humans feeds on the blood of humans.
- The lice are obligate ectoparasites which spread the Rickettsia prowazekii from one human to another.
- Lice upon infection show Rickettsiales in their faeces.
- When the infected lice feed on the blood of the person, the infected lice excrete their feces rich in Rickettsia to the baited wound and spread disease.
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