Leading the fight

"Usually, unless it's infectious, a whole family won't get the same disease," she said in an interview with the Global People magazine.

Uncertain about the causes, Zhang decided to admit them into hospital. On the same day, another patient, a seller from Huanan Seafood Market, reported the same symptoms and examinations also ruled out common viruses.

"China's Law on Licensed Doctors requires us to report diseases of unknown causes," said Zhang in a previous interview with China Central Television. The next day, she reported the four cases to the hospital authorities, who immediately informed the center for disease control and prevention of Jianghan district of Wuhan.

In the following two days, Zhang and her colleagues received three more patients, all with the same symptoms, and all from Huanan Seafood Market. On Dec 29, Zhang reported the situation to hospital authorities. The hospital hosted a consultation, which decided that the disease was truly unusual. They also found two similarly-affected patients in two other hospitals, whose addresses were listed as Huanan Seafood Market too.

The Hubei Provincial Center for Disease Control and Prevention immediately sent experts to investigate the seven patients at the Hubei Provincial Hospital of Integrated Chinese & Western Medicine. Six patients were transferred to Wuhan Jinyintan Hospital, a designated hospital for infectious diseases. The elderly couple's son, insisting on staying, was cured and discharged on Jan 7.

In the early morning of Jan 1, Huanan Seafood Market was shut down. It was the start of the new year, and 23 days later, it would be the Spring Festival. The traffic flow would be huge, because tens of thousands of people would be shopping for the festival.

"Things would have been much worse if the seafood market was not shut down," Zhang says.

"I'm happy that I did the right thing."

On Feb 6, Zhang was rewarded by Hubei's human resources and social security department and the province's health commission for being the first person to report the infectious disease to the government.

Yao Aidong, director of the medical examination center with Zhongnan Hospital of Wuhan University, Zhang's university classmate, said that Zhang worked very hard at university, and was fully devoted to her work.

"She used every opportunity to analyze difficult diseases with classmates, even at reunion parties, so we are not surprised at all that it was her who noticed the disease and reported it to the government," she says.

Apart from reporting the situation to the authorities, Zhang immediately isolated an area with nine beds in her department's 45-bed ward for patients with the unknown disease. Since receiving the elderly couple and their son, Zhang required all her colleagues in the department to wear facial masks. When they entered the isolation area, they would put on N95 masks supplied by the hospital. She also asked her colleague to buy 30 sets of white canvas work clothes online, which arrived on Dec 31.

"If we had applied for protective suits, the ordering process would have been slower," Zhang says.

"Anyway, another layer of clothes gave us more protection."

Zhang and her colleagues wore the canvas clothes beneath their doctor's coats and nurse's tunics until Jan 20, when experts announced that the novel coronavirus could be spread by people and the hospital equipped them with protective suits.

To prevent other patients from becoming infected, Zhang and her colleagues managed to persuade them to leave the hospital. Before the large-scale outbreak of the pneumonia caused by the novel coronavirus, no medical workers were infected in Zhang's department and no cross-infection was recorded among their patients.

After the six patients were transferred to Jinyintan, more patients with similar symptoms came, so that, on Jan 1, the isolation ward was full. During the New Year holiday, patients at respiratory and critical care departments increased drastically, from 100 per day to 230 per day. More patients shared the same symptoms as the first seven cases.