According to the official news of the Wuhan Metro Operation Official, on April 17, the Hubei Provincial Center for Disease Control and Prevention took a sample of the Wuhan rail transit environment and conducted laboratory COVID-19 virus nucleic acid testing. The sampling site involved Line 2 and Line 4. Surfaces of objects frequently contacted by passengers in multiple stations and trains, including ticket vending machines, security conveyor belts, entry gates, air outlets, elevator handrails, vertical button in the station, handrails in the car, exhaust vents, ground, etc. . On April 22, the nucleic acid test results were announced, all were negative, hereby announced.