( Scientists ( ( have ( found ( ( a ( single bacterium ) ) ( that ( causes ( ( ( Lyme disease ) , ) ( which ( can ( be ( cured ( if ( treated ( with antibiotics ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Scientists)) (VP (VBP have) (VP (VBN found) (NP (NP (DT a) (JJ single) (NN bacterium)) (SBAR (WHNP (WDT that)) (S (VP (VBZ causes) (NP (NP (JJ Lyme) (NN disease)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (MD can) (VP (VB be) (VP (VBN cured) (SBAR (IN if) (S (VP (VBN treated) (PP (IN with) (NP (NNS antibiotics)))))))))))))))))) (. .)))
Scientists have found a single bacterium that causes Lyme disease, which can be cured if treated with antibiotics.
(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.