Spanish nursing assistant contracts Ebola after treating seriously ill missionary in Madrid . Dozens of hospital staff are now being monitored for signs of the potentially deadly virus . Epidemiologist Professor David Heymann , who worked on the world 's first Ebola outbreak and now heads Public Health England , said the precise cause of the infection may never be known . Comment: Wake-up call for medics : `` Every hospital everywhere needs to be aware this could come to them ''
Spanish nursing assistant contracts Ebola after treating seriously ill missionary in Madrid . Dozens of hospital staff are now being monitored for signs of the potentially deadly virus . Comment: Wake-up call for medics : `` Every hospital everywhere needs to be aware this could come to them ''