Inclusion Exclusion
Population
KQ1: contacts of a confirmed case of COVID-19, SARS, or MERS KQ2: individuals from countries with a declared outbreak* of COVID-19, SARS, or MERS COVID-19 cases Symptomatic individuals of COVID-19, SARS, or MERS infections
Intervention
KQ1 and KQ2 Different types and locations of quarantines: Voluntary quarantine (self-isolation) Mandatory quarantine Quarantine in Private residence Hospital Public institution Others (cruise ships, hotels, etc.) Community quarantine Other interventions to reduce the spread of the virus, such as isolation, social distancing, personal protective equipment, hand hygiene, others
Control
No quarantine Different types and locations of quarantines Other interventions to reduce the spread of the virus, such as isolation, social distancing, personal protective equipment, hand hygiene
Outcomes
Incident cases of COVID-19 Onward transmissions Mortality Resource use Adverse psychological effects of quarantine
Study designs
Controlled trials Cohort studies Case-control studies Case series Crossover studies Time series Interrupted time series Modeling studies Case reports Systematic reviews (used for reference list checking)
Languages
English Chinese (English-language abstracts or, if available, English summaries provided by the Chinese WHO Collaborating Centre)