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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Clin+Microbiol
2014 ; 52
(12
): 4298-304
Nephropedia Template TP
gab.com Text
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English Wikipedia
Toward standardization of BK virus monitoring: evaluation of the BK virus R-gene
kit for quantification of BK viral load in urine, whole-blood, and plasma
specimens
#MMPMID25297334
Sueur C
; Solis M
; Meddeb M
; Soulier E
; Domingo-Calap P
; Lepiller Q
; Freitag R
; Bahram S
; Caillard S
; Barth H
; Stoll-Keller F
; Fafi-Kremer S
J Clin Microbiol
2014[Dec]; 52
(12
): 4298-304
PMID25297334
show ga
Screening of BK virus (BKV) replication is recommended to identify patients at
increased risk of BKV-associated diseases. However, the heterogeneity of
molecular techniques hinders the establishment of universal guidelines for BKV
monitoring. Here we aimed to compare the performance of the CE-marked BK virus
R-gene kit (R-gene) to the performance of our in-house assay for quantification
of BKV DNA loads (BKVL). A 12-specimen panel from the Quality Control for
Molecular Diagnostics (QCMD) organization, 163 urine samples, and 88 paired
specimens of plasma and whole blood (WB) from transplant recipients were tested.
Both the R-gene and in-house assays showed a good correlation within the QCMD
panel (r = 0.995 and r = 0.989, respectively). BKVL were highly correlated
between assays, although positive biases were observed with the in-house assay in
analysis of urine (0.72 ± 0.83 log10 copies/ml), plasma (1.17 ± 0.63 log10
copies/ml), and WB (1.28 ± 0.37 log10 copies/ml). Recalibration with a common
calibrator significantly reduced the bias in comparisons between assays. In
contrast, BKVL was underestimated with the in-house PCR in eight samples
containing BKV genotype II, presenting point mutations at primer-annealing sites.
Using the R-gene assay, plasma and WB specimens were found to be equally suitable
for quantification of BKVL, as indicated by the high correlation coefficient (r =
0.965, P < 0.0001). In conclusion, the R-gene assay demonstrated reliable
performance and higher accuracy than the in-house assay for quantification of
BKVL in urine and blood specimens. Screening of BKV replication by a
well-validated commercial kit may enable clinical laboratories to assess viral
loads with greater reproducibility and precision.