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Rickettsia
Rickettsia are a type of specialised bacteria which are mostly intracellular parasites and cause a number of diseases- epidemic typhus, Q fever, rocky mountain spotted fever amongst many others. Information can be obtained on
http://www.merck.com/mrkshared/mmanual/section13/chapter159/159a.jsp
Being very small they are difficult to detect. Serological tests are the best method, but immune fluorescence microscopy is also often used. A x40 objective is at the limit of detectablity but can show positive results.
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