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Fig. 1 | BMC Medicine

Fig. 1

From: Transmission characteristics of MERS and SARS in the healthcare setting: a comparative study

Fig. 1

Transmission trees of Middle East respiratory syndrome (MERS) and severe acute respiratory syndrome (SARS) outbreaks linked to health-care settings. a MERS outbreak in Al-Hasa, Saudi Arabia, from 1 April to 23 May 2013 [11]. b MERS outbreak in South Korea from 20 May to 5 July 2015 [13, 33]. c Nosocomial SARS outbreak in Singapore from 25 February to 11 May 2003 [16]. d Nosocomial SARS outbreak in Toronto from 23 February to 5 April 2003 [17]. Numbers inside the nodes of the tree are used to indicate a group of cases rather than a single case. Colors are used to distinguish the index case from secondary cases and highlight different exposure categories among secondary cases, including patient, visitor or family member, healthcare worker, and non-clinical staff working in the hospital

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