1. Reichman, L.B. (1991) The U-shaped curve of concern. Am Rev Respir Dis, 144, 741–2.
2. Iseman, M.D. (1992) A leap of faith. What can we do to curtail intrainstitu-tional transmission of tuberculosis. Ann Intern Med, 117, 251–3.
3. Murray, J.F. (1989) The white plague: down and out, or up and coming? Am Rev Respir Dis, 140, 1788–95.
4. World Health Organization (1992) Tuberculosis control and research strategies for the 1990s: Memorandum from a WHO Meeting. Bull WHO, 70, 17–21.
5. American Thoracic Society (1992) Control of tuberculosis in the United States. Am Rev Respir Dis, 146, 1623–33.