Effects of Mumps Outbreak in Hospital, Chicago, Illinois, USA, 2006
Figure 2. Immune status results among employees and close contacts exposed to 9 persons who had mumps, Northwestern Memorial Hospital, Chicago, Illinois, USA, 2006. For those deemed immune, immunity is grouped based on historical documentation of serologic status, mumps infection, or vaccination. All others were required to report for serologic testing during the outbreak; for those who complied with the required testing, immune status is provided.