PUBLISHED : Wednesday, 10 April, 2002, 12:00am
UPDATED : Wednesday, 10 April, 2002, 12:00am

Pearl, 9.30pm

Have we sterilised our world to the point of actually

increasing our risk of illness? Is our lack of exposure to

viruses making more of us sick? With existing antibiotics

failing to work, scientists are researching new ways to deal with infectious diseases - including deliberately infecting patients with viruses that may be able to seek out and kill certain bacteria. Sounds like scary stuff but it could be a case of turning the killers into the cure. This quality BBC

documentary follows four patients - a child infected with chickenpox, an asthma sufferer, a burns victim and a man with a brain tumour - in exploring human auto-immunity and how to help it fight disease.