Rajib S.A, Ogi Y, Hossain M.B, Ikeda T, Tanaka E, Kawaguchi T, Satou Y.

A SARS-CoV-2 Delta variant containing mutation in the probe binding regions used for RT-qPCR test in Japan exhibited atypical PCR amplification and might induce false negative result.

J Infect Chemother 28(5):669-677,2022. doi: 10.1016/j.jiac.2022.01.019

https://pubmed.ncbi.nlm.nih.gov/35144878/