100 years after the advent of TB vaccines, formulations vary widely

Each year, more than 100 million newborns around the world receive vaccinations against Mycobacterium tuberculosis, or TB, which infects about one-quarter of the world's population. Facilities across the world produce several different formulations of these vaccines, known as Bacille Calmette Guérin (BCG) vaccines. These are given interchangeably, yet new research from the Precision Vaccines Program at Boston Children's Hospital calls that practice into question.

source https://www.lifetechnology.com/blogs/life-technology-medical-news/100-years-after-the-advent-of-tb-vaccines-formulations-vary-widely