Rapid displacement of SARS-CoV-2 variant Delta by Omicron revealed by allele-specific PCR in wastewater. Rapid displacement of SARS-CoV-2 variant Delta by Omicron revealed by allele-specific PCR in wastewater. Link to Article Author(s): Lee et al. Reference: Water Research (2022) 221: 118809 Research Cluster(s): Environmental Engineering Cluster Theme(s): Environmental Genomics & Surveillance