Table II.

Characteristics of outbreak investigations included in this scoping review (arranged alphabetically)

Author, year	Country	Study design	Study population and sample size (N)	Key findings
Barani, 2021 [29]	India	Outbreak investigation	Housekeeping staff, N=120	In the wake of a COVID-19 cluster in a tertiary care cancer hospital, 2.5% of the housekeeping staff tested RT-PCR positive (3/120), and they showed the highest secondary attack rate (3.3 per 100 persons) among all healthcare workers.
Girgis, 2022 [30]	Egypt	Outbreak investigation	Housekeeping staff, N=118	In the wake of a hospital COVID-19 outbreak, 7.6% of the housekeeping staff were infected (9/118), and they had the highest risk of RT-PCR positivity (risk ratio 5.08, 95% CI 1.4–1.84) compared with other hospital staff.

CI, confidence interval; COVID-19, coronavirus disease 2019; RT-PCR, reverse transcription polymerase chain reaction; SARS-CoV-2, severe acute respiratory syndrome coronavirus-2.