Case 209. 

Electron micrograph of Coxiella burnetti in a mouse splenic macrophage
　 　 　 　
　 Morphology and electron density of C. burnetti in phagosomes of a macrophage are varied. 　
　 　 　 　

　

 　 C. burnetti is an exceptional rickettsia, in that it does not necessarily require the anthropod vector for transmission.