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Medical Definition of Rickettsieae
1. A tribe of gram-negative bacteria of the family rickettsiaceae whose organisms are found in arthropods and are pathogenic for man and certain other vertebrate hosts. (12 Dec 1998)
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1. A tribe of gram-negative bacteria of the family rickettsiaceae whose organisms are found in arthropods and are pathogenic for man and certain other vertebrate hosts. (12 Dec 1998)