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  1. Article: Number of cases across Africa remains low.

    Vaughan, Adam

    New scientist (1971)

    2020  Volume 245, Issue 3273, Page(s) 9

    Keywords covid19
    Language English
    Publishing date 2020-03-13
    Publishing country England
    Document type Journal Article
    ZDB-ID 120940-1
    ISSN 0262-4079 ; 0028-6664 ; 0369-5808
    ISSN 0262-4079 ; 0028-6664 ; 0369-5808
    DOI 10.1016/S0262-4079(20)30524-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Estimating the number of undetected COVID-19 cases exported internationally from all of China

    Tigist Ferede Menkir / Taylor Chin / James A Hay / Erik Surface / Pablo Martinez de Salazar / Caroline Buckee / Michael J Mina / Kamran Khan / Alexander Watts / Marc Lipsitch / Rene Niehus

    Abstract: ... The predicted number of cases exported to Egypt and South Africa exceeds the predicted number of cases exported ... the number of cases exported from cities outside of Wuhan from early December 2019 to late February 2020 ... the number of exported cases in six destinations for which predictions on exported cases have yet to be made ...

    Abstract During the early phase of the COVID-19 pandemic, when SARS-CoV-2 was chiefly reported in the city of Wuhan, cases exported to other locations were largely predicted using flight travel data from Wuhan. However, given Wuhan's connectivity to other cities in mainland China prior to the lockdown, there has likely been a substantial risk of exportation of cases from other Chinese cities. It is likely that many of these exportations remained undetected because early international case definitions for COVID-19 required a recent travel history from Wuhan. Here, we combine estimates of prevalence in 18 Chinese cities with estimates of flight volume, accounting for the effects of travel bans and the timing of Lunar New Year, to approximate the number of cases exported from cities outside of Wuhan from early December 2019 to late February 2020. We predict that for every one case from Wuhan exported internationally, there were approximately 2.9 cases from large Chinese cities exported internationally that likely remained undetected. Additionally, we predict the number of exported cases in six destinations for which predictions on exported cases have yet to be made, surveillance has likely been low, and where health care systems will likely face issues in managing current or potential outbreaks. We observe heterogeneities in exported case counts across these destinations. The predicted number of cases exported to Egypt and South Africa exceeds the predicted number of cases exported to Mauritania. These trends may anticipate differences in the timing and emergence of local transmission in these countries. Our findings highlight the importance of setting accurate travel history requirements for case definition guidelines in the initial phase of an epidemic, and actively updating these guidelines as the epidemic advances.
    Keywords covid19
    Publisher medrxiv
    Document type Article ; Online
    DOI 10.1101/2020.03.23.20038331
    Database COVID19

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  4. Article ; Online: Estimating the number of undetected COVID-19 cases exported internationally from all of China

    Menkir, Tigist Ferede / Chin, Taylor / Lipsitch, Marc / Niehus, Rene / Hay, James A / Surface, Erik / Martinez de Salazar, Pablo / Buckee, Caroline / Mina, Michael J / Khan, Kamran / Watts, Alexander

    medRxiv

    Abstract: ... The predicted number of cases exported to Egypt and South Africa exceeds the predicted number of cases exported ... the number of cases exported from cities outside of Wuhan from early December 2019 to late February 2020 ... the number of exported cases in six destinations for which predictions on exported cases have yet to be made ...

    Abstract During the early phase of the COVID-19 pandemic, when SARS-CoV-2 was chiefly reported in the city of Wuhan, cases exported to other locations were largely predicted using flight travel data from Wuhan. However, given Wuhan9s connectivity to other cities in mainland China prior to the lockdown, there has likely been a substantial risk of exportation of cases from other Chinese cities. It is likely that many of these exportations remained undetected because early international case definitions for COVID-19 required a recent travel history from Wuhan. Here, we combine estimates of prevalence in 18 Chinese cities with estimates of flight volume, accounting for the effects of travel bans and the timing of Lunar New Year, to approximate the number of cases exported from cities outside of Wuhan from early December 2019 to late February 2020. We predict that for every one case from Wuhan exported internationally, there were approximately 2.9 cases from large Chinese cities exported internationally that likely remained undetected. Additionally, we predict the number of exported cases in six destinations for which predictions on exported cases have yet to be made, surveillance has likely been low, and where health care systems will likely face issues in managing current or potential outbreaks. We observe heterogeneities in exported case counts across these destinations. The predicted number of cases exported to Egypt and South Africa exceeds the predicted number of cases exported to Mauritania. These trends may anticipate differences in the timing and emergence of local transmission in these countries. Our findings highlight the importance of setting accurate travel history requirements for case definition guidelines in the initial phase of an epidemic, and actively updating these guidelines as the epidemic advances.
    Keywords covid19
    Language English
    Publishing date 2020-03-26
    Publisher Cold Spring Harbor Laboratory Press
    Document type Article ; Online
    DOI 10.1101/2020.03.23.20038331
    Database COVID19

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