I hope you are not blaming yourself for this??? Unfortunately the spread of infectious diseases in hospital is all too common. One way to minimise this is for all staff to wash hands between patients (obvious to say I know, but its not always done ) and also visitors should be advised to wash hands on entering and leaving the ward. At our hospital there are signs asking visitors to wash hands but many people don?t bother. Even with those precautions though, having all those sick people in close proximity in a well heated and often poorly ventilated area is asking for spread of bugs. Ironic isn?t it that hospital can be the best place to be if you?re poorly but also the worst IMO.