Asymptomatic infected individuals with novel coronavirus do not have obvious clinical manifestations such as fever, malaise and dry cough, but test positive for viral nucleic acid, i.e. they carry the virus but do not develop it themselves.
If an individual has a history of travel to Wuhan and surrounding areas in the past 14 days, has a family gathering around him/her with a history of close contact with confirmed or suspected cases of novel coronavirus pneumonia, he/she needs to be promptly reported, isolated, and undergo appropriate medical observation and treatment.
If there are no such cases, there is usually no need to worry excessively. Pay attention to wearing a mask, washing hands regularly, paying attention to cleanliness at home, opening windows and ventilation regularly, and keeping your home and dishes clean.