Test for latent tb

Which test is most accurate in finding latent tb? Can mantoux test and sputum afb do the same?. I am in a doubt that i got infected from a friend who is under treatment of tb. I have no symptoms though, but i am worried.
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Doctor Answers (1) on Test for latent tb

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Venkat Raghav Bangalore | General Physician
Hello....tuberculosis is transmitted through air by aerosols... How do you know you are infected ...?sputum test is done if you have active tb with cough.. Montaux test says whether you had tb in past or latent infection... Tuberculin skin test suggests high risk of tb , consult general physician
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