Meta-analysis results for all treatments 
            
                 
            
        
            
            Treatment relative effect with 95% CI; and degree of certainty (adaptated from GRADE).
            
                
                method
            
        
        
            
                | Treament | Trials |  |  | 
            
                | clinical deterioration | clinical improvement | deaths | viral clearance | 
            | SNG001 inhaled interferon beta | 1 | - | - | - | - |  | 
| IFN alpha | 0 | - | - | - | - |  | 
| recombinant super-compound interferon rSIFN-co | 0 | - | - | - | - |  |