( ( Ehrlichia canis ) ( ( is ( ( an ( obligate ( , ( intracellular bacterium ) ) ) ) ( that ( ( ( acts ( as ( ( the ( causative agent ) ) ( of Ehrlichiosis ) ) ) ) , ) ( ( a disease ) ( ( most commonly ) ( affecting ( canine species ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Ehrlichia) (NNS canis)) (VP (VBZ is) (NP (NP (DT an) (JJ obligate) (, ,) (JJ intracellular) (NN bacterium)) (SBAR (WHNP (WDT that)) (S (VP (VBZ acts) (PP (IN as) (NP (NP (DT the) (JJ causative) (NN agent)) (PP (IN of) (NP (NNP Ehrlichiosis))))) (, ,) (S (NP (DT a) (NN disease)) (ADJP (RBS most) (RB commonly)) (S (VP (VBG affecting) (NP (JJ canine) (NNS species)))))))))) (. .)))
Ehrlichia canis is an obligate, intracellular bacterium that acts as the causative agent of Ehrlichiosis, a disease most commonly affecting canine species.
(ROOT (S (NP (NNS Bacteria)) (VP (VBP are) (NP (NP (DT the) (RBS most) (JJ numerous) (NNS species)) (PP (IN on) (NP (DT the) (NN planet))))) (. .)))