A large number of older children are being diagnosed with attention deficit hyperactivity disorder (ADHD), while diagnoses among younger children have held steady, a federal report said Wednesday.

A report by the Centers for Disease Control and Prevention (CDC) said about 5 percent of children between the ages of 6 and 17 are diagnosed with ADHD, a neurobehavioral developmental disorder

Foreign-born immigrants account for more than half of new tuberculosis cases in the U.S. in recent years, according to a study in a major medical journal.

Researchers suggest that immigrants to the U.S. from Africa and Southeast Asia should be tested and treated for tuberculosis before they arrive to prevent importing the disease

Tobacco companies have manipulated the menthol levels in cigarettes in recent years to hook new young smokers, a new study claims. The report by researchers at the Harvard School of Public Health could fuel support for more tobacco regulation.

The new study states that young people tolerate menthol cigarettes better than harsher non-menthol cigarettes. The low-level menthol cigarettes make it easier to begin smoking but as smokers become more accustomed to menthol, they prefer stronger menthol sensations

A gene which apparently evolved to protect people of African descent from malaria increases their chances of getting HIV infection by 40 percent, a new study finds.

The discovery not only marks the first genetic risk factor for HIV found only in people of African descent but also debunks the myth that people in sub-Saharan Africa were more likely to get HIV because of differences in their sexual behaviour, researchers added

The U.S. Senate passed a crucial bill on Wednesday that will triple funding for AIDS, tuberculosis and malaria around the world. Backed by President Bush, the plan received a 80-to-16 vote to authorize $48 billion over the next five years.

The amount authorized is $18 billion more than what Bush had requested. It would replace and expand the current $15 billion program started by the President in 2003. That act expires at the end of September