The Full form of BCG is Bacillus Calmette-Guerin. BCG is a vaccine that provides protection against tuberculosis; it helps in building immunity against tuberculosis. The vaccine was developed by two French bacteriologists Albert Calmette and Camille Guerin. It was first used by Dr Weil-Hale in 1921 for the treatment of a child who had tuberculosis. In the next three years, around 320 infants were vaccinated with BCG. The vaccine is given to children and persons at higher risk developing tuberculosis such as people living in the TB-affected parts of the world or children having one or more parents affected with TB or born in the TB-affected countries. It is also given to people suffering from bladder cancer or bladder tumors. This vaccine can cause complications in some people. It includes people who have had TB before, have a positive Mantoux test, have an HIV infection, have weak immune system due to an underlying condition or other medicines, and pregnant women. One should keep the vaccination area clean and dry for around 24 hours and should use a dry dressing with gauze if the vaccination area starts to ooze. If required, sterile alcohol swab can be used to clean the area. The vaccine should be taken after consulting the doctor.