Tuberculosis (abbreviated as TB for tubercle bacillus or Tuberculosis) is a common and often deadly infectious disease caused by mycobacteria, mainly Mycobacterium tuberculosis. Tuberculosis usually attacks the lungs but can also affect the central nervous system, the lymphatic system, bones, joints, skin etc. The classic symptoms of tuberculosis are chronic cough, fever, night sweats, and weight loss. Many countries use Bacillus Calmette-Guérin (BCG) vaccine as part of their TB control programs, especially for infants. BCG provides protection against severe forms of pediatric TB. However, most agree there is an urgent need for a newer, more effective vaccine that would prevent all forms of TB.