Mumps-virus-antibody-IgG test is used to determine whether a person has antibody that protects glands, measles and mumps antibodies. Measles and mumps antibodies are virus-specific proteins produced by the immune system in response to an infection by the measles or mumps virus, or in response to vaccination. The results for this test provide a numerical value for the antibody level, which can be compared to a reference interval to determine the immune state. Immunization cannot provide immunity for a person's entire life. A person who has had mumps, been treated, and recovered, may also develop a natural immunity. Mumps is a viral infection spread through respiratory secretion or saliva of the infected person. Most of the mumps infections cause flu-like symptoms such as fever, headache, and muscular pain. These are usually followed by swelling of salivary glands under one or both ears. . Most people recover from mumps without any serious health problems, but some may suffer from more serious complications.