( ( If ( neuraminidase ( is inhibited ) ) ) ( , ( ( the virus ) ( ( ( is not ) ( able ( to ( infect ( new cells ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (NN neuraminidase)) (VP (VBZ is) (ADJP (JJ inhibited))))) (, ,) (NP (DT the) (NN virus)) (VP (VBZ is) (RB not) (ADJP (JJ able) (S (VP (TO to) (VP (VB infect) (NP (JJ new) (NNS cells))))))) (. .)))
If neuraminidase is inhibited, the virus is not able to infect new cells.
(ROOT (S (NP (NNP Tamiflu)) (VP (VBZ inhibits) (NP (NP (NN spread)) (PP (IN of) (NP (NN virus))))) (. .)))