I am not a medical professional, so I may be getting some details wrong, but my understanding is that many pediatricians over-prescribe antibiotics for ear-infections (sometimes due to demands of the parents), and having additional information may help in this regard.

Over-prescribing antibiotics is bad because (1) some children have serious allergic reactions to them (and sometimes these develop over time), (2) they contribute to the evolution of antibiotic resistance.