BCG vaccine 400 per 100,000 in that higher risk context). The age of the person and the frequency with which BCG is given has always varied from country to country. BCG is prepared from a strain of the attenuated (virulence-reduced) live bovine tuberculosis bacillus, "Mycobacterium bovis", that has lost its ability to cause disease in humans. Because the living bacilli evolve to make the best use of available nutrients, they become less well-adapted to human blood and can no longer induce disease when introduced into a human host. Still, they are similar enough to their wild ancestors to provide some degree of
Inoculation theory counterarguments, the inoculation receiver will then seek out supporting information to further strengthen their threatened position. Finally, the held attitude or belief becomes resistant to a stronger attack, hence the medical analogy of a vaccine. Inoculation is a theory developed to strengthen existing attitudes and beliefs while building resistance to future counterarguments. For inoculation to be successful it is crucial that a threat (motivation for resistance) is imposed upon these existing ideas and refutational preemption (ability to build defenses against potential counterarguments) takes place after the inoculation. The argument that is presented through inoculation must be strong enough to initiate