Inactivated Mycobacterial Vaccine Nebulized Inhalation: A Effective Therapy for the Prevention and Treatment of Respiratory Diseases?

Nebulized inhalation therapy is an important method in the prevention and treatment of respiratory diseases, and inactivated mycobacterial vaccine nebulized inhalation has received a wide attention recently, but the roles and mechanisms are still not fully understood. A literature search showed there is a strong scientific rationale and evidence that nebulized inhalation of inactivated mycobacterial vaccine is effective in the prevention and treatment of respiratory diseases. Clinically available mycobacterial vaccines include Mycobacterium phlei (M. phlei), BCG, and Mycobacterium vaccae (M. vaccae). Nebulized inhalation of inactivated mycobacterial vaccine, especially M. vaccae, has been used in the prevention and treatment of respiratory diseases, such as asthma, respiratory syncytial virus (RSV), coronavirus disease 2019 (COVID-19), and sepsis. It acts on the respiratory tract directly, thus stimulating the body to produce an immune response, enhance respiratory immunity, and achieve prevention and treatment effects. Nebulized inhalation of inactivated mycobacterial vaccine will be an effective therapy in the prevention and treatment of respiratory diseases.