Patent ID: 8871502

Claim:
A culture medium device comprising: a plate containing a culture medium layer, said culture medium layer is made of a solid-state culture medium or a gel-state culture medium; a shield layer arranged inside said plate, covering an upper surface of said culture medium layer, and containing sugar at a concentration of x, wherein 0<x<0.1%(w/w), said shield layer being an agar layer with a thickness of 1.0 ±0.3 mm, an inorganic agar layer including inorganic additives with a thickness of 1.0 ±0.3 mm, or a layer containing a plant essential oil, the plant essential oil being at a concentration of 0.001 mg/mL-10 mg/mL and with a thickness of 5 μm-100 μm; and a lid covering said plate, wherein a ventilation gap exists between said lid and said plate.