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Evaluation of the extraction efficiency of infective HCoV-OC43 particles from 4.7 cm PTFE filters when using the shaking procedure. The titers of filter-recovered HCoV-OC43 are expressed as a percentage of the titer of the inoculated virus (% of recovery = (FFU recovered × 100)/FFU inoculated), and error bars represent the SEM of independent experiments. *pANOVA < 0.05.
