The statements refer to vaccination programmes for each of the diseases cholera, measles,
smallpox and tuberculosis (TB).
Which statement is correct for TB?
1 )
Most children are vaccinated before their first birthday.
2 )
The pathogen has not mutated or changed its antigens.
3 )
The pathogen lives in the intestine where antibodies cannot get to it.
The vaccine is not effective against some strains of the pathogen.
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