The control of tuberculosis, AIDS, and other infectious diseases in prisons is satisfactory and compares favourably with many developed places in the world, Centre for Health Protection Controller Dr Thomas Tsang says.

In response to media enquiries today he said the apparently excess prevalence of tuberculosis (TB) and human immunodeficiency virus (HIV) among prisoners as compared with the city's general population is attributable to major high-risk groups that contribute to the prison population, such as illegal immigrants and drug addicts. It is not due to transmission of these infections in prison.

There is no evidence to indicate there has been any outbreak of TB and HIV in prison.

People newly admitted to institutions must undergo medical examinations by resident doctors and receive treatment. Prisoners have to undergo chest X-rays upon admission to institutions to check for TB. Those with suspicious symptoms will be referred to the Department of Health's Tuberculosis & Chest Service for further diagnosis and treatment.

The Correctional Services Department's institutions will notify the centre whenever infectious diseases are identified or suspected. They will follow the centre's instructions and conduct control measures including medical surveillance, disinfection and isolation.

Inmates will be sent to public hospitals for treatment if necessary.