LONDON, England (CNN) -- Commonly thought of as a Victorian disease, tuberculosis, or TB, remains a persistent global health problem. It is a common disease of the lung that is airborne and highly contagious. If left untreated, tuberculosis can be deadly. It is found everywhere in the world. Many myths and misconceptions abound about TB. But how much do you know about the disease? Here, CNN compiles TB's killer facts: .
Tuberculosis is an airborne and contagious disease . If left untreated, the disease is deadly . The combination of TB and HIV is particularly lethal . Some drug-resistant forms of TB are virtually untreatable .