( ( VZV latency ) ( , ( however ( , ( ( ( is not ) ( ( a state ) ( of ( virus quiescence ) ) ) ) . ) ) ) ) )
(ROOT (S (NP (NNP VZV) (NN latency)) (, ,) (ADVP (RB however)) (, ,) (VP (VBZ is) (RB not) (NP (NP (DT a) (NN state)) (PP (IN of) (NP (NN virus) (NN quiescence))))) (. .)))
VZV latency, however, is not a state of virus quiescence.
(ROOT (S (PP (IN After) (S (VP (VBG infecting) (NP (DT a) (NN host))))) (, ,) (NP (DT some) (NNS viruses)) (VP (VBP enter) (NP (NP (DT the) (JJ inactive) (NN state)) (PP (IN of) (NP (NN latency))))) (. .)))