It depends on the condition of your illness. No one can give you assurance that you might fail nor pass the medical. Certainly, they're strict with ptb patient due to the nature of the disease and its mode of transmit.

Have your pre-employment medical done in your country and get the opinion of your doctor. If your ptb case is still active and/or there's possiblity to become reactive in the future, i'm affraid you may not pass the medical. But if your doctor says... its totally cured and healed, then you may have chance to get approval here.

Good luck!