Antas PRZ et al. - The vast majority of the current population has been vaccinated with BCG, with the possible requirement for a booster immunisation in adulthood for TB protection. BCG Moreau strain also protects against leprosy, meningitis and extrapulmonary forms of TB. Factors related to differences in strain, dosage and BCG administering protocol have been responsible for the variable efficacy of BCG.
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