Since patients with active TB may be sick and infectious, they may be advised to not work during the initial stages of treatment until they are no longer infectious. Most patients are no longer infectious after approximately two weeks of treatment. Such patients should continue treatment and can return to work; they are not a threat to other employees. TB patients in whom multi-drug resistance is confirmed or strongly suspected should not be allowed to return to work until they have had tests that confirm that they do not to have resistant TB. Adequate sick leave should be available to employees to allow them sufficient time to recover, especially those with drug-resistant TB as they may require hospitalisation for a few months.