In response to the West African outbreak of the deadly Ebola virus, some Boston hospitals are instructing clinical staff to ask patients as soon as they arrive about their travel histories, and reminding doctors and nurses of the symptoms. But hospital officials say they would be ready to quickly identify the illness and prevent its spread if an infected patient showed up, using protocols and equipment already in place. Deborah Yokoe, associate professor of medicine at Brigham and Women's Hospital, and Michael J. Van Rooyen, professor of medicine at Brigham and Women's Hospital, are quoted.