Tuberculosis vaccines: the past, present and future.

Area of Science:

• Immunology
• Vaccinology
• Infectious Diseases

Background:

• Tuberculosis (TB) remains a major global health threat, causing significant mortality.
• The current Bacillus Calmette-Guérin (BCG) vaccine, used for 80 years, shows limitations in preventing TB.
• There is a critical need for developing improved or novel tuberculosis vaccines.

Observation:

• Reviewing the historical use of the BCG vaccine.
• Identifying key immunological criteria for next-generation TB vaccines.
• Examining current research in mycobacterial organism-based and antigen-based vaccines.

Findings:

• New TB vaccines must meet specific immunological criteria for enhanced efficacy.
• Mycobacterium tuberculosis antigen-based vaccines show promise.
• Mucosal immunization and 'prime and boost' strategies are being explored.

Implications:

• Development of superior TB vaccines is crucial to combat the global burden of the disease.
• Understanding key immunological correlates will guide future vaccine design.
• Novel approaches like antigen-based vaccines and advanced regimens may overcome BCG limitations.