BCG vaccine extensively used even in countries where efficacy against pulmonary tuberculosis is negligible. A number of possible reasons for the variable efficacy of BCG in different countries have been proposed. None have been proven, some have been disproved, and none can explain the lack of efficacy in both low-TB burden countries (US) and high-TB burden countries (India). The reasons for variable efficacy have been discussed at length in a WHO document on BCG. BCG has protective effects against some non-tuberculosis mycobacteria. BCG has been one of the most successful immunotherapies. BCG vaccine has been the "standard of care for patients with
Inoculation theory get into a vehicle with a drunk driver. The trained group was far more prepared to combat the persuasive arguments. Additionally, Parker, Ivanov, and Compton (2012) found that inoculation messages can be an effective deterrent against pressures to engage in unprotected sex and binge drinking—even when only one of these issues is mentioned in the health message. Another study by Pfau, et al. (1992) examined the role of inoculation when attempting to prevent adolescents from smoking. One of the main goals of the study was to examine longevity and persistence of inoculation. They took a group of elementary school students