A study in England has strengthened evidence from Scandinavia that a vaccine used to prevent pandemic flu boosted the risk of sleep disorder among teens and children.
Scientists who created a mutant bird flu virus said they will resume the controversial research after taking a 12-month break to allay fears of the bug escaping the lab or falling into terrorist hands.
In 2007 a major HIV vaccine trial ground to a halt when the results showed that it actually increased rates of infection. Now researchers have discovered why.
