Rickettsiosis was associated with a rash (9.06; 3.91–24.9), CRP ≥5 mg/dL (4.03; 1.86–9.81), headache (3.01; 1.75–5.30), thrombocytopenia (2.61; 1.23–6.06), leukopenia (1.88; 1.19–2.98), and temperature ≥39.0 °C (1.66; 1.03–2.68). This evidence concerns the gene CRP and Rickettsiosis.