The infectious diseases caused by the rickettsiae. See Rickettsial diseases.

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  • Rickettsioses of the eastern hemisphere, tick-born

    There are 3 known diseases caused by infection with rickettsial agents. They are North Asian tick-borne rickettsiosis, Queensland tick typhus, and African tick typhus (fievre boutonneuse).

  • Rickettsiosis, North Asian tick-borne

    One of the tick-borne rickettsial diseases of the eastern hemisphere, similar to but less severe than Rocky Mountain spotted fever. Symptoms include fever, a small ulcer (eschar) at the site of the tick bite, swollen glands near the site of the bite (satellite lymphadenopathy), and a red, raised (maculopapular) rash.

  • Rift Valley fever

    A viral disease that is acute, causes fever in domestic animals (such as cattle, buffalo, sheep, goats, and camels) and humans, and is associated with mosquito-borne epidemics during years of heavy rainfall. Rift Valley fever is more deadly than West Nile virus. Rift Valley fever has not occurred in the United States (through 2003). However, […]

  • Right atrium

    The right upper chamber of the heart. The right atrium receives deoxygenated blood from the body through the vena cava and pumps it into the right ventricle which then sends it to the lungs to be oxygenated.

  • Right heart

    The right atrium and right ventricle.

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