Legionella feeleii
Legionella feeleii is a Gram-negative , rod-shaped bacterium from the genus "Legionella" which was isolated from an automobile plant and which was held responsible for causing Pontiac fever in 317 workers . 
<triplet> Gram-negative <subj> bacterium <obj> subclass of <triplet> Legionella <subj> Gram-negative <obj> Gram staining