
1) Animal order 2) Order rickettsiales
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https://www.crosswordclues.com/clue/rickettsiales

The Rickettsiales are among the most mysterious groups of Proteobacteria, owing largely to difficulties in cultivating them. Originally the group included all obligate endosymbiont bacteria. However, a number of species have been removed, such as Coxiella burnetii, the cause of Q fever. Environmental samples have found a variety of genes that orig...
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http://en.wikipedia.org/wiki/Rickettsiales

(from the article `bacteria`) ...(cholera bacteria), Pseudomonas, Nitrosomonas, Thiobacillus.Order RickettsialesObligate intracellular parasites; generally short rods. Multiply by ...
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http://www.britannica.com/eb/a-z/r/48

An order of gram-negative bacteria including many that may cause disease in man or in other vertebrate or invertebrate hosts. ... (12 Dec 1998) ...
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http://www.encyclo.co.uk/local/20973

(rĭ-ket″se-a´lēz) an order of bacteria comprising small, gram-negative, rod-shaped or coccoid, often pleomorphic microorganisms occurring as elementary bodies that typically multiply only inside the cells of the host. Found as parasites in both vertebrates and invertebrates, which may serve as vect...
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http://www.encyclo.co.uk/local/21001

[
n] - pleomorphic gram-negative microorganisms
Found on
http://www.webdictionary.co.uk/definition.php?query=Rickettsiales
order Rickettsiales noun pleomorphic Gram-negative microorganisms
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.