The life cycle of Coxiella burnetii

Propose a life cycle for Coxiella.
Why do Coxiella show variable Gram stain results-that is, they may stain gram-positive or gram-negative? Should they be classified as gram-positive or gram-negative?
What disease does C. burnetii cause? Why can this disease be transmitted by airborne routes while other (closely related) rickettsia require insects and ticks for transmission to humans?

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