Well I am not sure in TB case but in Hepatitis and HIV they will not leave you to stay in Qatar. In TB, cases vary as sometime the person Xray is not clear and they will put him / her on medication for a month or so and then will check again. In that case they will allow but again if TB is positive then might the answer will be negative but i am not sure as now a day there is 100% treatment for TB. sorry to ask you but how was ur medical report in your home country?