5 | Conclusion
Use of BCG vaccine in early childhood can provide benefits by reducing
risk of allergic disease, especially asthma. This finding supports the
hypothesis that BCG vaccine should be encouraged as prevention in
asthma. However, the findings from this study did not suggest that use
of BCG vaccine in early childhood can reduce the risk of developing
allergic disease among all races, significant effect of BCG vaccination
is currently only evident among European countries and American
countries.