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Virus inactivation assay. The white bars refer to eluent samples inoculated with HCoV-OC43 and previously exposed to PTFE or glass-fiber filters and subjected to the shake-vortex procedure. Control samples (black bars) were prepared by inoculating the same inoculum of fresh eluent. On Y axis, the titers of HCoV-OC43 are expressed as FFU/ml. Error bars represent the SEM of independent experiments.
