The emergence of zoonotic viruses like severe acute respiratory syndrome coronavirus (SARS-CoV), Middle East respiratory syndrome coronavirus (MERS-CoV), and SARS-CoV-2 have significantly impacted global health and economy. The discovery of other viruses in wildlife reservoir species present a threat for future emergence in humans and animals. Therefore, assays that are less reliant on virus-specific information, such as neutralization assays, are crucial to rapidly develop diagnostics, understand virus replication and pathogenicity, and assess the efficacy of therapeutics against newly emerging viruses. Here, we describe the discontinuous median tissue culture infectious dose 50 (TCID50) assay to quantitatively determine the titer of any virus that can produce a visible cytopathic effect in infected cells.
Keywords: Biosafety level 3; Cytopathic effect; Endpoint dilution; Permissive cell line; Risk group 3 pathogen; Titer; Virus infectivity.
© 2024. The Author(s), under exclusive license to Springer Science+Business Media, LLC, part of Springer Nature.