Possible explanations for this are the lack of health care available to them, high risk behaviors like drug abuse, large numbers of undiagnosed TB cases, crowding of shelters, increased length of stay, and insufficient ventilation systems. In recent years, attention has been directed at the mode of transmission in specific settings where populations with identified risk factors for TB are presented with susceptible individuals. These settings include hospitals and clinics. TB is transmitted through the air via tiny particles called droplet nuclei. Modern air-conditioning systems recirculate air through a building and can potentially spread infection when an infectious patient is present.
Increases reflect, in part, effects of recent immigration.
These people also constitute the largest numbers of recent immigrants to the United States. Conclusion Tuberculosis prevention and control are still technically and economically feasible. However, more must be done to establish surveillance programs with laboratory support. More research is needed to devise case prevention regimens that are well tolerated, well complied with, and do not pose the risk of multiresistance. More health workers need to be trained to suspect tuberculosis and to conduct timely and appropriate tests confirming the diagnosis.