Sentence examples for assay was negative from inspiring English sources
However, the qPCR assay was negative for 54 of 229 individuals with palpable nodules.
If the Accuprobe assay was negative, isolates were identified as M. tuberculosis by PCR as previously described [13].
This is different than the results of Soysal et al [12] who reported that their in-house IFN-γ ELISPOT assay was negative more often in BCG immunized than in unimmunized children.
The lipL32 assay was negative for the non-pathogenic Leptospira spp. tested, but the rrs assay was positive for two strains (L. terpstrae serovar Hualin strain LT11-33 and L. yanagawae serovar Saopaulo strain Sao Paulo).
Interestingly, the PCR assay was negative, which could be due to a spontaneous eradication of the spirochetes prior to treatment or a low density of spirochetes in the large erythematous area.
In our previous study, a high proportion of children with a household TB contact positive by TST were negative by QFT-TB Gold and the assay was negative in almost half of the children with a TST >15 mm.
Antigenemia assay were negative in all cases, however, viral nucleic acid were found in 6.3 and in 6.0% of the patients in abortion and in control groups, respectively.
A CSF cryptococcal antigen titer and HTLV I/II antibody assay were negative; a VDRL test was non-reactive.
The DELFIA and CAP were comparable for sensitivity however some patients positive to one assay were negative to the other and visa versa.
By that time, RVFV antigen assay is negative.
