Clinical suspicion was defined by typical clinical features, exposure combined with lymphopenia [11], or typical radiological changes [12]. Information provided to clinicians on factors that may influence admission was based on existing literature and included C-reactive protein (CRP) [13], troponin [14], percentage of pulmonary infiltrates on chest radiograph [8], co-morbidities [15], and respiratory rates [16]. Other prognostic markers, such as hyperferritinaemia, may have also been considered prior to discharge. This evidence concerns the gene CRP and lymphopenia.