Table 1.

Basal data from positive and negative control groups, % (n)

Group	Sex	Age (mean, range)	Department of origin	Clinical criteria	Radiological criteria	Microbiological criteria
Positive control	Male 62% (31/50)	59.62 (27–75)	Emergency 76% (38/50)	98%* (49/50)	94%** (47/50)	PCR SARS-CoV-2 100% (50/50)
Negative control	Male 54% (27/50)	60.84 (17–96)	Internal medicine 70% (35/50)	100% (50/50)	98%*** (49/50)	34% (17/50) Yes**** 66% (33/50) No

*The most common symptoms in mild to moderate patients were fever, fatigue, and dry cough, followed by other symptoms including headache, nasal congestion, sore throat, myalgia, and arthralgia. A minority of patients had gastrointestinal symptoms. Four patients died during the recovery (two men and two women).

**Mild patients also manifested unilateral and focal ground-glass opacity (GGO) which gradually developed to bilateral or multilobular lesions. As the disease progressed further, GGOs evolved to consolidation lesions, presenting mixed pattern or pure consolidation

***No radiological data of pneumoniae. Microbiological exam was confirmatory of non-SARS-CoV-2 origin

****Streptococcus pneumoniae (n = 4), Chlamydophila pneumoniae (n = 4), Mycoplasma pneumoniae (n = 2), CMV (n = 2), Rhinovirus/Enterovirus (n = 2), Parainfluenza virus (n = 1), MTB (n = 1), Mycobacterium fortuitum (n = 1)