of bacteria that are fastidious, obligate - TopicsExpress

of bacteria that are fastidious, obligate intracellular pathogens They are pleomorphic & coccobacillary The organisms will not show up on Gram stain, but can be seen when either Gimenez or Giemsa stains are used 2. Spotted Fever Group Typhus Group Transitional group The Others The outer membrane protein A (ompA) gene is present in spotted fever but not typhus group organisms 3. Rickettsia are usually introduced into human skin by the bite of an insect (flea or louse) or an arachnid (tick or mite) These arthropods serve as both host and vector to the rickettsia and reside on the reservoir animals (dogs, mice, rats, and flying squirre

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