RT‐PCR alone;
RT‐PCR, clinical expertise, and imaging (for example, CT thorax);
repeated RT‐PCR several days apart or from different samples;
plaque reduction neutralisation test (PRNT) or enzyme‐linked immunosorbent assay(ELISA) tests;
information available at a subsequent time point;
World Health Organization (WHO) and other case definitions (see Appendix 1).