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Answer for the clue "Pleomorphic gram-negative microorganisms ", 13 letters:
rickettsiales

Word definitions for rickettsiales in dictionaries

Wikipedia Word definitions in Wikipedia
The Rickettsiales , also called rickettsias , are an order of small proteobacteria . Most of those described survive only as endosymbionts of other cells. Some are notable pathogens, including Rickettsia , which causes a variety of diseases in humans. On ...