A nasty bug has spread in Hong Kong hospitals. It first started in 2006 and now infects as many as 3,000 people a year. A doctor at the University of Hong Kong believes it spreads very fast because hospitals are not clean enough. He says only the best cleaning methods should be used in hospitals. He also urged the Hospital Authority to do more to control the 'superbug'. Background The bug is dangerous because most drugs, even antibiotics, do not work. It does not harm healthy people, but can pose a threat to older and weaker patients.