The local government said on Saturday, that man, 70, in China’s Hubei Province was infected with coronavirus but did not show symptoms until 27 days later.
According to the Centers for Disease Control and Prevention (CDC), the coronavirus’ incubation period is believed to be 14 days.
But a study of six family members infected with the virus, published in the Journal of the American Medical Association, revealed that one patient’s incubation period was 19 days long.
Zhong Nanshan, who discovered the SARS virus, published that suggested the coronavirus incubation period could be up to 24 days.
A longer incubation period could complicate efforts to contain spread of the epidemic that has so far killed more than 2,000 people and spread outside China.
The man, only identified by his family name, Jiang, on Jan. 24 drove his car back in northwestern Hubei, where he had close contact with his sister, who had been infected, according to the government website of Hubei, the virus epicenter.
He had a fever on February 20 and tested positive for coronavirus a day later, according to the government statement, Reuters reports.