( ( Lyme disease ) ( ( is ( caused ( by ( ( a bacterium ) ( carried ( by ( ( tiny ticks ) ( that ( live ( ( ( ( ( ( in ( wooded ( and ( grassy areas ) ) ) ) nationwide ) , ) but ) especially ) ( in ( ( ( the Northeast ) and ) ( upper Midwest ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Lyme) (NN disease)) (VP (VBZ is) (VP (VBN caused) (PP (IN by) (NP (NP (DT a) (NN bacterium)) (VP (VBN carried) (PP (IN by) (NP (NP (JJ tiny) (NNS ticks)) (SBAR (WHNP (WDT that)) (S (VP (VBP live) (PP (PP (IN in) (NP (JJ wooded) (CC and) (JJ grassy) (NNS areas)) (ADVP (JJ nationwide))) (, ,) (CC but) (RB especially) (PP (IN in) (NP (NP (DT the) (NN Northeast)) (CC and) (NP (JJ upper) (NN Midwest))))))))))))))) (. .)))
Lyme disease is caused by a bacterium carried by tiny ticks that live in wooded and grassy areas nationwide, but especially in the Northeast and upper Midwest.
(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.