Positive for novel coronavirus means positive nucleic acid test, that is, the presence of viral nucleic acid detected using RT-PCR, i.e. reverse transcription polymerase chain reaction; gene sequencing with high homology to known coronaviruses can also be considered positive. Currently, due to the tense development of the epidemic and the severe actual situation, clinical diagnostic cases are added in the Wuhan area, i.e., although there is no positive manifestation of nucleic acid testing, or gene sequencing with high homology to known coronaviruses, there are obvious epidemiological features, physical diagnostic features, and CT manifestations. Clinical signs include fever, dry cough, malaise, and CT showing fine lung spots and late gross glassy changes. Recent exposure to suspected or confirmed patients, or a history of close contact with other related persons may also confirm the diagnosis. Kits for IgM and IgG are currently being developed. The presence of these two immunoglobulins can also complement the diagnosis to a large extent. Content source: Dr. You Lai