Where exactly does Legionella travel in the body? Can it travel to the brain and through the blood after infection the lungs?
Legionella infects the lungs (pneumonia). It can travel by blood to other parts of the body including heart and kidney. Brain infection is extremely rare, but is theoretically possible.
Neurologic and central nervous system (brain, CNS) problems may also be due to immune-reactions to Legionella. See Lin COID 2011, page 351, top right.