WHO began to promote integration of NTPs into primary health care in the 1970s, once the effectiveness of ambulatory tuberculosis treatment had been proven. By 2007–08, tuberculosis services were being delivered through primary care in 20 of the 22 high-burden countries and 83% of 173 countries reporting progress in tuberculosis control to WHO. In about 64% of these 173 countries, including ten high-burden countries, antituberculosis drugs were supplied to services through integrated supply systems for essential drugs, and in 86%, tuberculosis diagnosis was delivered through general public health laboratory networks.