The investigators hypothesize that early institution of TNFα inhibitor therapy in patients with severe COVID-19 infections will prevent further clinical deterioration and reduce the need for advanced cardiorespiratory support and early mortality. To address this hypothesis, a prospective, single center, phase 2 trial is proposed to assess the efficacy of infliximab or infliximab-abda in hospitalized adult patients with severe or critical COVID-19. Observations from this study will inform the conduct of prospective randomized controlled studies to follow.