( ( A ( suspected ( positive case ) ) ) ( ( ( can not ) ( be ( ( called ( negative ( by ( laboratory diagnosis ) ) ) ) ( unless ( ( the ( negative ( CI-ELISA results ) ) ) ( have ( been ( confirmed ( by ( a ( PCR test ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (VBN suspected) (JJ positive) (NN case)) (VP (MD can) (RB not) (VP (VB be) (VP (VBN called) (ADJP (JJ negative) (PP (IN by) (NP (NN laboratory) (NN diagnosis)))) (SBAR (IN unless) (S (NP (DT the) (JJ negative) (JJ CI-ELISA) (NNS results)) (VP (VBP have) (VP (VBN been) (VP (VBN confirmed) (PP (IN by) (NP (DT a) (NNP PCR) (NN test))))))))))) (. .)))
A suspected positive case cannot be called negative by laboratory diagnosis unless the negative CI-ELISA results have been confirmed by a PCR test.
(ROOT (S (NP (PRP We)) (VP (VBP call) (NP (NP (DT an) (JJ incorrect) (NN test) (NN result)) (SBAR (WHNP (WDT that)) (S (VP (MD should) (VP (VB have) (VP (VBN been) (ADJP (JJ positive) (NP (NP (DT a) (-LRB- -LRB-) (NN n) (-RRB- -RRB-)) (ADJP (JJ false) (JJ negative))))))))))) (. .)))