1. In confirmed cases (PCR) had serology with IgG/IgM
2. Most new have IgM + 3-5 days after onset
3. Recovery of IgG is 4 times or more higher than acute phase
5. CRRT for significantly ill patients
6. For severe and critically ill patients with elevated IL-6 and extensive lung disease recommend tocilizumab (ongoing trial in China)
Some exclusion are ALT/AST > 5x ULN, active TB, or certain fungal infections
8. Children with severe or critical cases consider IVIG
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