Page "Bacillus Calmette–Guérin" Paragraph 8
from
Wikipedia
The most controversial aspect of BCG is the variable efficacy found in different clinical trials that appears to depend on geography.
Trials conducted in the UK have consistently shown a protective effect of 60 to 80 %, but those conducted elsewhere have shown no protective effect, and efficacy appears to fall the closer one gets to the equator.
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