. 2022 Aug 25;10(9):1396. doi: 10.3390/vaccines10091396

Table 1.

Characteristics of the included studies.

Study Author, Year	Country	Study Type	Vaccine	Dominant Variant	Study Periods	Age Range	Booster		No booster		Outcome	NOS
Study Author, Year	Country	Study Type	Vaccine	Dominant Variant	Study Periods	Age Range	Positive	Negative	Positive	Negative	Outcome	NOS
Paul E Drawz, et al. (2022) [9]	United States	Test-negative case–control design	BNT162b2 or mRNA-1273	Delta	From 29 August 2021 to 27 November 2021	≥19	1347	46,526	15,702	139,718	Infection	6
Aditya Sharma, et al. (2022) [10]	United States	Test-negative case–control design	BNT162b2 or mRNA-1273	Omicron	From 1 December 2021 to 12 March 2022	NA	4226	404,548	5356	403,418	Infection	8
Jing Lian Suah, et al. (2022) [11]	Malaysia	Test-negative case–control design	BNT162b2 or CoronaVac or AZD1222	Delta	From 27 October 2021 to 4 February 2022	≥18	38567	882,109	280,560	720,077	Infection	8
Jing Lian Suah, et al. (2022) [11]	Malaysia	Test-negative case–control design	BNT162b2 or CoronaVac or AZD1222	Omicron	From 5 February 2022 to 22 February 2022	≥18	135,425	424,968	171,058	224,378	Infection	8
Adeel A Butt, et al. (2022) [12]	United States	Retrospective cohort study	BNT162b2 or mRNA-1273	Omicron	From 1 January 2022 to 20 February 2022	≥21	8444	454,506	10,462	452,488	Infection	5
Nick Andrews, et al. (2022) [13]	England	Test-negative case–control design	ChAdOx1-S or BNT162b2	Delta	From 13 September 2021 to 5 November 2021	≥18	17,655	143,001	159,593	234,684	Symptom	8
Paskorn Sritipsukho, et al. (2022) [14]	Thailand	Test-negative case–control design	CoronaVac or BNT162b2 or ChAdOx1-S	Delta	From 25 July 2021 to 23 October 2021	≥18	13	478	181	787	Infection	5
Jill M. Ferdinands, et al. (2022) [15]	United States	Test-negative case–control design	mRNA vaccine	Delta	From 26 August 2021 to 22 January 2022 *	≥18	347	13,860	8136	77,235	Infection	6
Jill M. Ferdinands, et al. (2022) [15]	United States	Test-negative case–control design	mRNA vaccine	Omicron	From 26 August 2021 to 22 January 2022 *	≥18	1938	8993	8351	11,471	Infection	6

Note: * In the original tables of the included study, the authors only distinguished between delta-dominated periods and omicron-dominated periods, without specifying the time points of the two periods.