Looking for a needle in a haystack. SARS-CoV-2 variant characterization in sewage

Identifier:  imarina:9242253

Handle: https://hdl.handle.net/20.500.11797/imarina9242253

Authors:  Itarte M; Bofill-Mas S; Martínez-Puchol S; Torrell H; Ceretó A; Carrasco M; Forés E; Canela N; Girones R; Rusiñol M

Abstract:
SARS-CoV-2 variants are emerging worldwide, and monitoring them is key in providing early warnings. Here, we summarize the different analytical approaches currently used to study the dissemination of SARS-CoV-2 variants in wastewater and discuss their advantages and disadvantages. We also provide preliminary results of two sensitive and cost-effective approaches: variant-specific reverse transcription-nested PCR assays and a nonvariant-specific amplicon deep sequencing strategy that targets three key regions of the viral spike protein. Next-generation sequencing approaches enable the simultaneous detection of signature mutations of different variants of concern in a single assay and may be the best option to explore the real picture at a particular time. Targeted PCR approaches focused on specific signature mutations will need continuous updating but are sensitive and cost-effective. © 2021 The Authors