title: Titration of human coronaviruses using an immunoperoxidase assay.
abstract: Determination of infectious viral titers is a basic and essential experimental approach for virologists. Classical plaque assays cannot be used for viruses that do not cause significant cytopathic effects, which is the case for prototype strains 229E and OC43 of human coronavirus (HCoV).Therefore, an alternative indirect immunoperoxidase assay (IPA) was developed for the detection and titration of these viruses and is described herein. Susceptible cells are inoculated with serial logarithmic dilutions of virus-containing samples in a 96-well plate format. After viral growth,viral detection by IPA yields the infectious virus titer, expressed as 'Tissue Culture Infectious Dose 50 percent' (TCID50). This represents the dilution of a virus-containing sample at which half of a series of laboratory wells contain infectious replicating virus. This technique provides are liable method for the titration of HCoV-229E and HCoV-OC43 in biological samples such as cells, tissues and fluids [corrected].
authors.affiliation: Laboratory of Neuroimmunovirology, INRS-Institut Armand-Frappier, Canada. lambert.francine@iaf.inrs.ca
authors.forename: Francine
authors.initials: F
authors.lastname: Lambert
authors.forename: Helene
authors.initials: H
authors.lastname: Jacomy
authors.forename: Gabriel
authors.initials: G
authors.lastname: Marceau
authors.forename: Pierre J
authors.initials: PJ
authors.lastname: Talbot
mesh_terms: D002478:Cells, Cultured; D003139:Common Cold / Q000473:pathology / Q000821:virology; D028941:Coronavirus 229E, Human / Q000737:chemistry* / Q000302:isolation & purification; D018352:Coronavirus Infections / Q000473:pathology / Q000821:virology; D028962:Coronavirus OC43, Human / Q000737:chemistry* / Q000302:isolation & purification; D006801:Humans; D007124:Immunoenzyme Techniques / Q000379:methods*; D015203:Reproducibility of Results; D017186:Titrimetry / Q000379:methods; D014764:Viral Proteins / Q000032:analysis* / Q000096:biosynthesis
chemical_list: D014764:Viral Proteins