An infected patient's rash.

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The notable symptoms of Rickettsia are skin lesions, headaches, backaches, and rashes. 

Now with the diseases caused by Rickettsia, the symptoms are: 
Typhus Fever: severe headache, chills, high fever, muscle aches, rashes, swollen lymph nodes
Rocky Mountain Spotted Fever: high fever, Rash, Diarrhea, Muscle Aches, Headaches, Vomiting, Nausea
Q Fever: High Fever, malaise, confusion, nausea, vomiting, swollen lymph nodes