Firstly your son has been imunised against TB at birth with his BCG vaccination.This should offer him some protection against catching TB.Then he has only been exposed to a possible TB carrier for a period of 2 weeks. TB is obviously infectious but rather slow in its onset. It is unlikely that he has developed TB already. Your son should have the TB test done. This will probably come up slightly positive due to his BCG, but if it is strongly positive he will need a chest XRay done. Only if TB test is strongly positive will it be advised that he be treated for TB for 6 months.
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