More than a month, able to infect people, but no symptoms herself...
“You had this patient from Wuhan where the virus is, traveling to where the virus wasn’t. She remained asymptomatic and infected a bunch of family members and you had a group of physicians who immediately seized on the moment and tested everyone.”
According to the report by Dr. Meiyun Wang of the People’s Hospital of Zhengzhou University and colleagues, the woman traveled from Wuhan to Anyang on Jan. 10 and visited several relatives. When they started getting sick, doctors isolated the woman and tested her for coronavirus. Initially, the young woman tested negative for the virus, but a follow-up test was positive.
All five of her relatives developed COVID-19 pneumonia, but as of Feb. 11, the young woman still had not developed any symptoms, her chest CT remained normal and she had no fever, stomach or respiratory symptoms, such as cough or sore throat.”
Looks like there is a wide range of immunity amoungst these people. Some drop dead quickly and some just get the sniffles from the same virus...apparently.
Virus are odd that way. Typhoid Mary infected others, never had a symptom herself.