The steady decline in tuberculosis case rate reversed in the mid-1980s
, and tuberculosis cases have increased dramatically since that time.
Important factors contributing to this increase are the human immunode
ficiency virus (HIV) epidemic and tuberculosis occurring in foreign-bo
rn persons. Tuberculosis outbreaks have occurred in HIV clinics and wa
rds, prisons, homeless shelters, nursing homes, and health care facili
ties. Some of the outbreaks have involved strains of tuberculosis resi
stant to multiple antituberculosis drugs. Recent recommendations for i
nitial therapy of tuberculosis include the use of four drugs and direc
tly observed therapy in an effort to prevent the emergence of further
drug resistance.