Table 1 Baseline characteristics of study participants.

		Total
Sex^a	Male	161 (28%)
Sex^a	Female	417 (72%)
Professional category^a	Nurse/Auxiliary nurse/Stretcher-bearer	288 (50%)
	Physician	147 (25%)
	Lab technologist/other tech.	45 (8%)
	Administrative officers, Other^b	98 (17%)
Age^c		42,1 (11.6)
Daily contact with patients^a	No	123 (21%)
Daily contact with patients^a	Yes	455 (79%)
Working in a COVID-19 unit^a	No	315 (54%)
Working in a COVID-19 unit^a	Yes	263 (46%)
Close contact with confirmed COVID19 or suspected case^a	No	137 (24%)
Close contact with confirmed COVID19 or suspected case^a	Yes	441 (76%)
Previously diagnosed with COVID-19 by rRT-PCR^a	No	539 (93%)
Previously diagnosed with COVID-19 by rRT-PCR^a	Yes	39 (7%)
Comorbidities^a,d	No	517 (89%)
Comorbidities^a,d	Yes	61 (11%)
Household size^c		2.8 (1.2)
Received Flu vaccine (2019–2020 season)^a	No	339 (59%)
Received Flu vaccine (2019–2020 season)^a	Yes	239 (41%)
Reporting COVID-19 compatible symptoms within previous months^a	No	368 (64%)
	Yes	210 (36%)

^an (Column percentage).
^bIncludes, cleaning, kitchen and maintenance staff.
^cArithmetic Mean (SD) [n].
^dComorbidities include: heart and liver disease, diabetes, chronic respiratory and renal disease, cancers and autoimmune, and other immunological disorders.

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