A doctor spays medical alcohol at a 75 percent concentration on packs of samples from throat swabs at a laboratory department of Shanxi Bethune Hospital in Taiyuan, capital of North China's Shanxi Province. Photo:China News Service

A doctor tests nucleic acid samples at a laboratory department of Shanxi Bethune Hospital in Taiyuan, capital of North China's Shanxi Province. Photo:China News Service

A doctor records information of patients’ throat swabs samples at a laboratory department of Shanxi Bethune Hospital in Taiyuan, capital of North China's Shanxi Province. Photo:China News Service

Every nucleic acid testing involves a dozen steps taken within 6 hours, according to the director of the laboratory department of Shanxi Bethune Hospital in Taiyuan, capital of North China's Shanxi Province. Photo:China News Service

Medical workers have their hands disinfected in a laboratory department of Shanxi Bethune Hospital in Taiyuan, capital of North China's Shanxi Province. Photo:China News Service

A doctor tests nucleic acid samples at a laboratory department of Shanxi Bethune Hospital in Taiyuan, capital of North China's Shanxi Province. Photo:China News Service