Pagerank algo is being used by a hospital , objective - to cut down infections!!

Via : Google tool could search out hospital superbugs

Our new model is based very much on the way Google has achieved number one status among search engines," he explains. “When [Google’s] spiders crawl the web they build up a connectivity matrix of links between pages.”
Node search

Shepherd’s idea is to build a similar matrix describing all interactions between people and objects in a hospital ward, based on observing normal daily activity.