In a routine examination, some blood is taken and analyzed. The results show a high IgM titer for the mumps antigen. This would indicate the person is just coming down with mumps. has never been exposed to mumps . has just recovered from mumps . is allergic to mumps . is immune to mumps .

This would indicate that the person is just coming down with mumps.

A high IgM titer for the mumps antigen in a routine examination indicates that the person is just coming down with mumps. IgM is the first antibody produced by the immune system in response to an infection, suggesting a recent or ongoing infection with the mumps virus.