Shares rose in hospital cleaning specialist Tristel after the AIM-listed outfit's products were praised by a hospital in Coventry for helping get rid of Clostridium difficile (C.diff) and Norovirus infections.The University Hospitals Coventry and Warwickshire NHS Trust said use of Tristel's Jet trigger spray gel for areas close to the patient and Tristel Fuse for larger surface areas had transformed its infection control results. As a result of the campaign, every ward in the trust has been free of C. diff for a period of at least 100 days, 95% of all wards have been C. diff free for 200 days and 14 wards have achieved a year clear.The Trust's Infection Prevention team has received the accolade of national hospital team of the year from the UK Infection Prevention Society. Tristel Chief Executive Paul Swinney said: "The number of hospitals that have adopted our chlorine dioxide surface disinfectants to kill C. diff, Norovirus and the multi-drug resistant bacteria which are now grabbing the headlines has grown steadily in the past few years. "In the hospital marketplace it can take years for novel technology to prove itself and for its impact to be felt, especially when it comes to infection control."He said surface disinfection was now a "key driver" behind the group's sales growth in the UK.Shares in Tristel were up 7.7% to 49p at 16:20 on Thursday.OH