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trench fever:see rickettsiarickettsia
, any of an order (Rickettsiales) of very small microorganisms, many disease-causing, that live in vertebrates and are transmitted by bloodsucking parasitic arthropods such as fleas, lice (see louse), and ticks.
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(Wolhynian fever, five-day fever), an epidemic disease belonging to the rickettsioses. It was first described by the German scientists H. Werner and H. His in 1916. It is transmitted by lice. Major epidemics of trench fever broke out among the troops during World War I (1914-18) on the Western and Eastern fronts (especially in Volyn’ [Wolhynia] Province; hence the name), in the Balkans, and in Syria and Mesopotamia.