Table 2.

Selected Characteristics of the 519 HCWs with a Laboratory-Confirmed Diagnosis of SARS-CoV-2 Infection.

	1st Wave March–August 2020		2nd Wave September–December 2020		3rd Wave January–August 2021		Chi-Square Test (p-Value) *
Sex	n	%	n	%	n	%	0.224
Female	24	71%	183	56%	97	61%
Male	10	29%	143	44%	62	39%
Total	34	100%	326	100%	159	100%
Job title	n	%	n	%	n	%
Doctors	20	59%	99	30%	38	24%	<0.001
Nurses	11	32%	131	40%	60	38%	0.602
Technicians	1	3%	13	4%	11	7%	0.160
Administrative	0	0%	24	7%	22	14%	0.012
Other HCWs	2	6%	59	18%	28	18%	0.194
Total	34	100%	326	100%	159	100%
Age group	n	%	n	%	n	%
20–29	6	18%	52	16%	28	18%	0.903
30–39	9	26%	61	19%	27	17%	0.427
40–49	7	21%	62	19%	32	20%	0.876
50–59	8	24%	101	31%	50	31%	0.649
60–69	4	12%	50	15%	22	14%	0.790
Total	34	100%	326	100%	159	100%
Risk	n	%	n	%	n	%	0.390
High risk of infection Unit	7	21%	66	20%	24	15%
Low risk of infection Unit	27	79%	260	80%	135	85%
Total	34	100%	326	100%	159	100%

* p-value refers to the significance of the difference in the frequency of positives among columns.