Most Rickettsia are not transmitted from human to human.

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Most Rickettsia are not transmitted from human to human.

Rickettsial infections are transmitted mainly through arthropod vectors rather than direct human-to-human contact. These bacteria require a bite from an infected tick, flea, mite, or louse to move from animal reservoirs to humans, so people are typically incidental hosts rather than sources of infection for others. For example, Rocky Mountain spotted fever is spread by ticks, epidemic typhus by body lice, and murine typhus by fleas. In all of these, transmission between people without a vector is not the usual route. The important idea is that the spread hinges on a vector, not direct person-to-person contact, so the statement is true.

Rickettsial infections are transmitted mainly through arthropod vectors rather than direct human-to-human contact. These bacteria require a bite from an infected tick, flea, mite, or louse to move from animal reservoirs to humans, so people are typically incidental hosts rather than sources of infection for others. For example, Rocky Mountain spotted fever is spread by ticks, epidemic typhus by body lice, and murine typhus by fleas. In all of these, transmission between people without a vector is not the usual route. The important idea is that the spread hinges on a vector, not direct person-to-person contact, so the statement is true.

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