A team of US researchers has detected at least four "cryptic" variants of SARS-CoV-2, the virus that causes Covid-19, in samples of wastewater from New York City's public sewer system.
Marc Johnson, Professor of molecular microbiology and immunology at the University of Missouri and a co-corresponding author on the study, believes the results suggest the "cryptic" mutations they identified in New York City could be linked to possible animal origins.
