Abstract: A liquid (30) containing a virus passes through a solid phase (10) made of a polymer having a hydrophobic group to cause the solid phase (10) to retain viruses (40), and then an organic solvent (70) causes the viruses (40) to be eluted from the solid phase (10). As a result, it is possible to rapidly concentrate a virus sample at a high concentration rate.

Abstract: The present disclosure provides a test method for assessing the possibility of infection of residents without performing periodic PCR tests of residents of a facility in question. One embodiment is an infectious disease test method that includes a sampling step for collecting a sample from sewage during a sampling period in a route from where sewage is discharged from a facility until flowing into a public sewage pipe, an analysis step for analyzing the sample to obtain information relating to the existence of an infectious disease pathogen in the sample, and a notification step for notifying the facility of the information together with the sampling period.