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Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Infect 2021 ; 82 (1): 117-125 Nephropedia Template TP
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A highly effective reverse-transcription loop-mediated isothermal amplification (RT-LAMP) assay for the rapid detection of SARS-CoV-2 infection #MMPMID33271166
Fowler VL; Armson B; Gonzales JL; Wise EL; Howson ELA; Vincent-Mistiaen Z; Fouch S; Maltby CJ; Grippon S; Munro S; Jones L; Holmes T; Tillyer C; Elwell J; Sowood A; de Peyer O; Dixon S; Hatcher T; Patrick H; Laxman S; Walsh C; Andreou M; Morant N; Clark D; Moore N; Houghton R; Cortes NJ; Kidd SP
J Infect 2021[Jan]; 82 (1): 117-125 PMID33271166show ga
The COVID-19 pandemic has illustrated the importance of simple, rapid and accurate diagnostic testing. This study describes the validation of a new rapid SARS-CoV-2 RT-LAMP assay for use on extracted RNA or directly from swab offering an alternative diagnostic pathway that does not rely on traditional reagents that are often in short supply during a pandemic. Analytical specificity (ASp) of this new RT-LAMP assay was 100% and analytical sensitivity (ASe) was between 1?x?10(1) and 1?x?10(2) copies per reaction when using a synthetic DNA target. The overall diagnostic sensitivity (DSe) and specificity (DSp) of RNA RT-LAMP was 97% and 99% respectively, relative to the standard of care rRT-PCR. When a C(T) cut-off of 33 was employed, above which increasingly evidence suggests there is a low risk of patients shedding infectious virus, the diagnostic sensitivity was 100%. The DSe and DSp of Direct RT-LAMP (that does not require RNA extraction) was 67% and 97%, respectively. When setting C(T) cut-offs of =33 and =25, the DSe increased to 75% and 100%, respectively, time from swab-to-result, C(T) < 25, was < 15 min. We propose that RNA RT-LAMP could replace rRT-PCR where there is a need for increased sample throughput and Direct RT-LAMP as a near-patient screening tool to rapidly identify highly contagious individuals within emergency departments and care homes during times of increased disease prevalence ensuring negative results still get laboratory confirmation.