A group of researchers in US claimed that if the BCG shot is injected directly to the blood stream then it works wonderfully over today's skin deep shot.

A series of tests carried on certain monkeys showed positive effect when the vaccine was directly injected into blood stream which led to more research and consequent results.The quantity used was higher than usual for all these tests said the researchers..

Worldwide tuberculosis killed more than 1.7 million people in a year. It was recorded that BCG vaccine is more effective in babies, but , its can not protect the teens and the elders completely from the threat of TB in the lungs.
Researchers has confirmed that though more research is required to come to a final conclusion hiowever, they are very hopeful about the progeress.