A sick child may have influenza or RSV. These virus infections have different treatment options, so the physician requests antibody titer tests. The results are as follows: anti-influenza antibodies are primarily IgM, and anti-RSV antibodies are all IgA and IgG. Which of the following is the most appropriate interpretation?

Question

Quizplus · Accepted Answer

The presence of primarily IgM antibodies against influenza suggests a current infection because IgM is the first antibody type produced in response to an infection. The presence of IgA and IgG antibodies against RSV suggests past exposure, as these antibodies are indicative of a secondary or past immune response.

A Sick Child May Have Influenza or RSV