Table 1.

Summary of patients and sampling information.

Room	Age	Air sampling	Surface sampling	Symptoms in sampling day	Severity of the illnessa	Diagnosis by PCR test	Daysb	Use of PAC	Room size (m2)	T (°C)	R.H. (%)	PM2.5c (μg/m3)	PM10c (μg/m3)
A	28	Yes	No	Headache, fatigue, loss of smell and taste	Severe	Yes	5	Yes	15	21	60	5	6
B	21	Yes	Yes	Sore throat, fatigue	Mild	Yes	3	Yes	16	23	48	5	5
C	60	Yes	No	No symptoms	Mild	Yes	5	Yes	60	22	50	6	7
D	54	Yes	No	Cough, fever, fatigue	Very severe	Yes	2	Yes	13	22	47	5	6
E	35	Yes	No	Cough, fever, fatigue	Mild	Yes	3	Yes	27	22	58	6	6
F	75	Yes	Yes	Control = No symptoms		No		Yes	22	23	44	6	7
G	44	Yes	Yes	Control = No symptoms		No		Yes	17	21	48	5	5
H	46	Yes	No	Fever, fatigue	Mild	Yes	5	No	22
I	48	Yes	No	Headache, fatigue, loss of smell and taste	Mild	Yes	47	No	16

^aMedical diagnostic.

^bNumber of days since the date of clinical diagnosis to the sampling day.

^cPM concentrations after the PAC usage.