Tuberculosis (TB) is a leading killer of people with HIV, and providing therapy for both illnesses simultaneously saves lives - according to new guidelines on the treatment of drug-susceptible TB developed jointly by the American Thoracic Society (ATS), Centers for Disease Control and Prevention (CDC) and Infectious Diseases Society of America (IDSA). Treatment of TB in the presence of HIV infection is one of several special situations addressed in the new guidelines, published today in the journal Clinical Infectious Diseases.