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===Overview===
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*Cause systemic diseases in animals
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*Usually use arthropod vectors
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===Characteristics===
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*Non-motile, pleomorphic Gram-negative organisms
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*Obligate intracellular pathogens
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*Require live cells for culture such as tissue culture cells or embryonated eggs
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*Require Romanowsky stains
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*Host and cell type specificity
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