We see a distressed young girl being made comfortable in an isolation ward. The Medical Officer of Health, Dr. Ian Phelps is told by the hospital's Senior House Officer that the young girl, Doreen Taylor, who has typhoid, is not responding to any of the other antibiotics. It is a totally resistant strain. There are four other suspect cases, all from Doreen's school and they have visited a lot of areas. 'So it's bad, we could be on the verge of an epidemic,' says Phelps. 'Yes. And absolutely no effective drug to fight it with.'... (thetvdb.com)