Positive chills yesterday.
 patient denies chills
(ROOT (NP (NP (NP (JJ Positive) (NNS chills)) (NP (NN yesterday))) (. .)))
(ROOT (S (NP (NN patient)) (VP (VBZ denies) (NP (NNS chills)))))
( ( ( Positive chills ) yesterday ) . )
( patient ( denies chills ) )