Replaced by a different protocol.

This is a Phase 1b study to assess the safety and efficacy of COVI-MSC in treating post COVID-19 "long haulers" with pulmonary compromise.

This is a Phase 1b multicenter study to assess the safety and efficacy of COVI-MSC in treating post COVID-19 "long haulers" with pulmonary compromise.

COVI-MSC will be administered intravenously on Day 0, Day 2, and Day 4.

Inclusion Criteria:

• Has had prior laboratory-confirmed SARS-CoV-2 infection as determined by an approved polymerase chain reaction (PCR) or an approved antigen test of any specimen
• Has had a recent (within a week) negative SARS-CoV-2 test (an approved PCR or antigen test)
• Has had at least moderate or severe post-COVID-19 pulmonary symptoms for at least 3 months which have resulted in reduced physical functioning compared to pre-COVID-19 status
• Willing to follow contraception guidelines

Exclusion Criteria:

• Clinically improving pulmonary status over the month prior to screening
• Undergone a previous stem cell infusion unrelated to this trial
• Pregnant or breast feeding or planning for either during the study
• Suspected uncontrolled active bacterial, fungal, viral, or other infection
• History of a splenectomy, lung transplant or lung lobectomy
• Concurrent participation in another clinical trial involving therapeutic interventions (observational study participation is acceptable)