( ( In California ) ( , ( ( the ( western ( black-legged tick ) ) ) ( ( is ( ( the ( primary carrier ) ) ( of ( ( ( Borrelia burgdorferi ) , ) ( ( the bacterium ) ( causing ( Lyme disease ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NNP California))) (, ,) (NP (DT the) (JJ western) (JJ black-legged) (NN tick)) (VP (VBZ is) (NP (NP (DT the) (JJ primary) (NN carrier)) (PP (IN of) (NP (NP (NNP Borrelia) (NNP burgdorferi)) (, ,) (NP (NP (DT the) (NN bacterium)) (VP (VBG causing) (NP (JJ Lyme) (NN disease)))))))) (. .)))
In California, the western black-legged tick is the primary carrier of Borrelia burgdorferi, the bacterium causing Lyme disease.
(ROOT (S (NP (JJ Lyme) (NN disease)) (VP (VBZ is) (VP (VBN caused) (PP (IN by) (NP (NNS bacteria))))) (. .)))
Lyme disease is caused by bacteria.