<unk>  is a genus of bacteria in family Rickettsiaceae.
They are obligate intracellular gram negative bacteria found in insects and mammals.  They are spread through the bites or feces of infected insects.
Orientia
Dementia
Semantic dementia
Multi-infarct dementia
Early-onset Alzheimer's disease
Akinetic-rigid syndromes
Parkinsonism
Dementia with Lewy bodies