Jet-air dryers should not be used in hospital toilets - Across three hospitals in three different countries in a multi-centre trial, bacterial counts were significantly higher in the toilets on the days that jet-air dryers were in use, compared with paper towels.
Source: https://www.leeds.ac.uk/news/article/4284/jet-air_dryers_should_not_be_used_in_hospital_toilets