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. 2020 Apr 8;4(4):CD013574.
doi: 10.1002/14651858.CD013574.

Quarantine alone or in combination with other public health measures to control COVID-19: a rapid review

Barbara Nussbaumer-Streit  1 , Verena Mayr  1 , Andreea Iulia Dobrescu  1 , Andrea Chapman  1 , Emma Persad  1 , Irma Klerings  1 , Gernot Wagner  1 , Uwe Siebert  2   3   4   5 , Claudia Christof  1 , Casey Zachariah  1 , Gerald Gartlehner  1   6
Affiliations

Quarantine alone or in combination with other public health measures to control COVID-19: a rapid review

Barbara Nussbaumer-Streit et al. Cochrane Database Syst Rev. .

Update in

Abstract

Background: Coronavirus disease 2019 (COVID-19) is a rapidly emerging disease that has been classified a pandemic by the World Health Organization (WHO). To support WHO with their recommendations on quarantine, we conducted a rapid review on the effectiveness of quarantine during severe coronavirus outbreaks.

Objectives: We conducted a rapid review to assess the effects of quarantine (alone or in combination with other measures) of individuals who had contact with confirmed cases of COVID-19, who travelled from countries with a declared outbreak, or who live in regions with high transmission of the disease.

Search methods: An information specialist searched PubMed, Ovid MEDLINE, WHO Global Index Medicus, Embase, and CINAHL on 12 February 2020 and updated the search on 12 March 2020. WHO provided records from daily searches in Chinese databases up to 16 March 2020.

Selection criteria: Cohort studies, case-control-studies, case series, time series, interrupted time series, and mathematical modelling studies that assessed the effect of any type of quarantine to control COVID-19. We also included studies on SARS (severe acute respiratory syndrome) and MERS (Middle East respiratory syndrome) as indirect evidence for the current coronavirus outbreak.

Data collection and analysis: Two review authors independently screened 30% of records; a single review author screened the remaining 70%. Two review authors screened all potentially relevant full-text publications independently. One review author extracted data and assessed evidence quality with GRADE and a second review author checked the assessment. We rated the certainty of evidence for the four primary outcomes: incidence, onward transmission, mortality, and resource use.

Main results: We included 29 studies; 10 modelling studies on COVID-19, four observational studies and 15 modelling studies on SARS and MERS. Because of the diverse methods of measurement and analysis across the outcomes of interest, we could not conduct a meta-analysis and conducted a narrative synthesis. Due to the type of evidence found for this review, GRADE rates the certainty of the evidence as low to very low. Modeling studies consistently reported a benefit of the simulated quarantine measures, for example, quarantine of people exposed to confirmed or suspected cases averted 44% to 81% incident cases and 31% to 63% of deaths compared to no measures based on different scenarios (incident cases: 4 modelling studies on COVID-19, SARS; mortality: 2 modelling studies on COVID-19, SARS, low-certainty evidence). Very low-certainty evidence suggests that the earlier quarantine measures are implemented, the greater the cost savings (2 modelling studies on SARS). Very low-certainty evidence indicated that the effect of quarantine of travellers from a country with a declared outbreak on reducing incidence and deaths was small (2 modelling studies on SARS). When the models combined quarantine with other prevention and control measures, including school closures, travel restrictions and social distancing, the models demonstrated a larger effect on the reduction of new cases, transmissions and deaths than individual measures alone (incident cases: 4 modelling studies on COVID-19; onward transmission: 2 modelling studies on COVID-19; mortality: 2 modelling studies on COVID-19; low-certainty evidence). Studies on SARS and MERS were consistent with findings from the studies on COVID-19.

Authors' conclusions: Current evidence for COVID-19 is limited to modelling studies that make parameter assumptions based on the current, fragmented knowledge. Findings consistently indicate that quarantine is important in reducing incidence and mortality during the COVID-19 pandemic. Early implementation of quarantine and combining quarantine with other public health measures is important to ensure effectiveness. In order to maintain the best possible balance of measures, decision makers must constantly monitor the outbreak situation and the impact of the measures implemented. Testing in representative samples in different settings could help assess the true prevalence of infection, and would reduce uncertainty of modelling assumptions. This review was commissioned by WHO and supported by Danube-University-Krems.

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Conflict of interest statement

Barbara Nussbaumer‐Streit: no conflicts of interest with respect to the topic of this manuscript Verena Mayr: no conflicts of interest with respect to the topic of this manuscript Andreea Iulia Dobrescu: no conflicts of interest with respect to the topic of this manuscript Andrea Chapman: no conflicts of interest with respect to the topic of this manuscript Emma Persad: no conflicts of interest with respect to the topic of this manuscript Irma Klerings: no conflicts of interest with respect to the topic of this manuscript Gernot Wagner: no conflicts of interest with respect to the topic of this manuscript Uwe Siebert: no conflicts of interest with respect to the topic of this manuscript Claudia Christof: no conflicts of interest with respect to the topic of this manuscript Casey Zachariah: no conflicts of interest with respect to the topic of this manuscript Gerald Gartlehner: no conflicts of interest with respect to the topic of this manuscript

Figures

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Analytic framework
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Study flow diagram
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