Table 2.

Diagnostic criteria of COVID-19 (Data from Diagnosis and Treatment Program of Novel Coronavirus Pneumonia (trial seventh version)).⁵⁵

Suspected cases

Patients have any epidemiological history and conform to at least two clinical manifestations, or patients without clear epidemiological history conform to three clinical manifestations.

Epidemiological history:

Ⅰ. Travel or residence history of an affected area or close contact with a suspected or confirmed case within 14 days before onset

Ⅱ. Have contact with COVID-19 cases (nucleic acid positive) within 14 days prior to onset

Ⅲ. Have contact with patients with fever or respiratory symptoms from an affected area, or from communities with COVID-19 cases

Ⅳ. Cluster onset (two or more cases of fever and/or respiratory symptoms within 2 weeks in a small area such as home, office, school, and class)

Clinical manifestations:

Ⅰ. Fever and/or respiratory symptoms

Ⅱ. With COVID-19 imaging characteristics

Ⅲ. Normal or reduced number of white blood cells and/or lymphocytes in early COVID-19

Confirmed cases

The suspected cases have at least one of the following etiological or serological evidences.

Ⅰ. The real-time fluorescent RT-PCR for specimens with a positive result of SARS-CoV-2 RNA

Ⅱ. Virus gene sequences are highly homologous to SARS-CoV-2

Ⅲ. Positive SARS-CoV-2 specific IgM antibody and IgG antibody in serum; the serum SARS-CoV-2 specific IgG antibody changes from negative to positive or is four times higher in the recovery period than in the acute phase