PMID- 37876415 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20231026 IS - 2405-8440 (Print) IS - 2405-8440 (Electronic) IS - 2405-8440 (Linking) VI - 9 IP - 10 DP - 2023 Oct TI - To reduce cytotoxicity when testing the virucidal activity of chemical disinfectants and biocides: The "T-25 method" as an alternative to "large-volume-plating". PG - e20728 LID - 10.1016/j.heliyon.2023.e20728 [doi] LID - e20728 AB - When testing the virucidal activity of biocides, the non-inactivated residual virus is titrated on cell cultures by the end point dilution method on 96-well tissue culture plates. However, residues of the biocide to be tested also come into contact with the cell cultures in varying concentrations and thus can lead to cytotoxic effects even at high levels of dilution. In the European standards for testing biocides, in particular disinfectants, methods such as Large-Volume-Plating (LVP) method and, in some guidelines, gel filtration procedures are described for reducing cytotoxic effects in the case of highly cytotoxic products, if the classical dilution method proves to be impractical. In order to enable the testing of highly cytotoxic biocides for their activity against viruses, an alternative method for reducing cytotoxicity is introduced, which is based on a procedure of isolating infectious viruses from cytotoxic patients' materials such as stool and can be applied when the other methods fail. CI - (c) 2023 HygCen Germany GmbH. FAU - Rheinbaben, F V AU - Rheinbaben FV AD - HygCen Germany GmbH, Schwerin, Germany. FAU - Kohnlein, J AU - Kohnlein J AD - HygCen Germany GmbH, Schwerin, Germany. FAU - Schmidt, N AU - Schmidt N AD - HygCen Germany GmbH, Schwerin, Germany. FAU - Hildebrandt, C AU - Hildebrandt C AD - HygCen Germany GmbH, Schwerin, Germany. FAU - Werner, S AU - Werner S AD - HygCen Germany GmbH, Schwerin, Germany. LA - eng PT - Journal Article DEP - 20231009 PL - England TA - Heliyon JT - Heliyon JID - 101672560 PMC - PMC10590779 OTO - NOTNLM OT - Biocide OT - Cytotoxicity OT - Neutralization OT - T-25 method COIS- I wish to submit an revised original research article entitled "To reduce cytotoxicity when testing the virucidal activity of chemical disinfectants and biocides: The "T-25 method" as an alternative to "Large-Volume Plating"" for consideration by the Journal of Virological Methods. I confirm that this work is original and has not been published elsewhere, nor is it currently under consideration for publication elsewhere. All comments of the first review have been revised in this version. We have no conflicts of interest to disclose. EDAT- 2023/10/25 06:42 MHDA- 2023/10/25 06:43 PMCR- 2023/10/09 CRDT- 2023/10/25 03:49 PHST- 2023/03/01 00:00 [received] PHST- 2023/09/28 00:00 [revised] PHST- 2023/10/04 00:00 [accepted] PHST- 2023/10/25 06:43 [medline] PHST- 2023/10/25 06:42 [pubmed] PHST- 2023/10/25 03:49 [entrez] PHST- 2023/10/09 00:00 [pmc-release] AID - S2405-8440(23)07936-7 [pii] AID - e20728 [pii] AID - 10.1016/j.heliyon.2023.e20728 [doi] PST - epublish SO - Heliyon. 2023 Oct 9;9(10):e20728. doi: 10.1016/j.heliyon.2023.e20728. eCollection 2023 Oct.