New guidelines aimed at increasing awareness about the hazards associated with legionella, improving the management of potential sources of legionella, and improving the reporting and investigation of cases of legionellosis have been released by the Ministry of Health. The guidelines are intended for use by building owners and managers, as well as by health protection staff when advising or following up identified cases. The guidelines note that while legionellosis is a notifiable disease under the Health Act 1956, the number of notifications in New Zealand is lower than the number of positive laboratory results. The guidelines are available here.