John goes to his physician complaining of a high fever (38.2° C [102° F]), muscle aches, cough, and a headache. These symptoms came on suddenly, and his physician thinks John may have the flu. What kind of antibody is his body producing against the virus?

Question

Quizplus · Accepted Answer

When the body first encounters a virus, it produces IgM antibodies, which are the first responders to the infection. IgG antibodies are produced later and provide long-term immunity. Since John's symptoms came on suddenly, it is likely that his body is producing IgM antibodies against the flu virus. IgE is associated with allergies, and IgD's function is not well understood.

John Goes to His Physician Complaining of a High Fever