The Guardian: TB vaccine BCG effective for twice as long as previously thought — study
“…The vaccination was thought to work for only 10 to 15 years, but a new study shows that the protective effect of the BCG has been underestimated. Researchers from the London School of Hygiene and Tropical Medicine say they have found that it protects half of those given it at the age of 12 or 13 for at least 20 years and then the effects wane…” (Boseley, 8/31).