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The number of COVID-19-positive Saudi cases was lower than that of non-Saudi cases, which were in contrast to that of MERS; COVID-19 appeared to be remarkably similar to MERS with respect to recovered cases. However, the numbers of critical and dead COVID-19 patients have been much lower than those of MERS patients. The largest proportion of COVID-19 and MERS cases (44.05% and 40.8%, respectively) were recorded in the Western region. MERS and COVID-19 exhibited similar threats to the lives of adults and the elderly, despite lower mortality rates during the