Used in developing countries as vaccination against tuberculosis. It has an efficacy of between 50 and 80 percent, depending on the natural occurrance of other forms of mycobacteria? other than [mycobacterium tuberculosis]? in the environment in which a person lives in.
Not currently recommended in developed countries as routine childhood vaccination because the incidence of tuberculosis tends to be much lower there.
Having had a previous BCG vaccination will affect a [Mantoux test]? result.
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