Thanks for your query. MT positive indicates that he is infected with TB bacteria but not diseased. We need not treat MT positive as long as your son is not symptomatic like fever
, weight loss
. Also you have given full course for TB twice. Previous exposure can also give MT positive but it doesn't mean that you have to treat TB every time you find it positive.
You need not worry. MT positive indicates previous infection which you have already treated. Hence no need to treat agai and again.
Dr. Balaji CHinnasami , MD
Assiatant Professor, Pediatrics