Rapid influenza diagnostic tests can help detect the influenza virus in the respiratory tract. This is an important test for children, as the presence of both influenza A and B can cause serious illness. This type of testing is very informative, as it can tell us whether or not a child has an influenza infection. One of the advantages of this test is that it provides us with results within just 30 minutes. For those who are at high risk of contracting influenza, this test can prove to be very beneficial.