Comparison of carrimycin vs. lopinavir/ritonavir or umifenovir or chloroquine in patients with COVID-19 pneumonia. Open-label RCT (NCT04286503, not yet recruiting). Primary endpoints: (a) fever to normal time (follow-up 30 days); (b) pulmonary inflammation resolution time (follow-up 30 days); (c) negative conversion of throat swab RT-PCR at EOT.