( HIV ( ( is ( ( the virus ) ( that ( causes ( ( ( ( acquired ( immunodeficiency syndrome ) ) ( -LRB- ( `` ( ( AIDS '' ) -RRB- ) ) ) ) , ) ( ( an ( infectious disease ) ) ( characterized ( by ( immune ( system failure ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP HIV)) (VP (VBZ is) (NP (NP (DT the) (NN virus)) (SBAR (WHNP (WDT that)) (S (VP (VBZ causes) (NP (NP (NP (VBN acquired) (JJ immunodeficiency) (NN syndrome)) (PRN (-LRB- -LRB-) (`` ``) (NP (NNP AIDS)) ('' '') (-RRB- -RRB-))) (, ,) (NP (NP (DT an) (JJ infectious) (NN disease)) (VP (VBN characterized) (PP (IN by) (NP (JJ immune) (NN system) (NN failure))))))))))) (. .)))
HIV is the virus that causes acquired immunodeficiency syndrome (&quot;AIDS&quot;), an infectious disease characterized by immune system failure.
(ROOT (S (NP (DT The) (NN term)) (ADVP (RB immunodeficiency)) (VP (VBZ means) (NP (NP (DT a) (NN failure) (, ,) (NN insufficiency) (, ,) (CC or) (NN delay)) (PP (IN in) (NP (NP (DT the) (NN response)) (PP (IN of) (NP (NP (DT the) (JJ immune) (NN system)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (MD may) (VP (VB be) (VP (VBN acquired) (CC or) (VBN inherited)))))))))))) (. .)))