Why is BCG vaccine not effective for adults?

Related questions

1. Is TB a live vaccine?
2. Can you kiss someone with tuberculosis?
3. When did they stop giving TB vaccine?
4. Do adults need two MMR shots?
5. Does TB vaccination protect you?
6. Who gets tuberculosis vaccine?
7. Is TB Vaccine Effective?
8. Can I get TB if I was vaccinated?
9. What vaccines were given in the 70's?
10. Is there a vaccine for TB in Canada?

Tags

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4. #miliary
5. #people
6. #meningeal
7. #tuberculosis
8. #effective
9. #infected
10. #protection
11. #against
12. #always
13. #already
14. #disease
15. #vaccine
16. #children
17. #prevent