The virus examination of the subject is performed efficiently and in a short time with a small number of facilities. An initialization light source of the protein detection device is made to emit light, the filter is irradiated with ultraviolet light, the expiration introduction means is attached to the protein detection device, the suction means is driven to capture at least a part of the aerosol contained in the expiration sucked into the box body via the expiration introduction means, After the suction means is stopped, the excitation light source is caused to emit light and the filter is imaged by the imaging means, and the determination means receives the image of the filter imaged by the imaging means, It is determined whether or not the virus exists in the breath of the subject on the basis of the result of the aggregation of the light-emitting regions. The expiration introduction...

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