bacille calmette guérin also known as bcg is a vaccine given throughout many parts of the world. it is derived from an atypical mycobacterium but offers some protection from developing active tuberculosis especially in infants and children. this vaccination is believed to be important in parts of the world where tuberculosis is quite common. this is not the case in the united states. when bcg has been administered future ppd and tine skin tests remain positive and can cause some confusion when trying to diagnose tb. it is also important to realize that even with a bcg vaccine in childhood tuberculosis can still occur in an adult exposed to the tuberculosis bacteria which calls into question the real utility and effectiveness of this vaccination.
is there a vaccine against tuberculosis?