I had never heard of this term before! But I walked into the doctor's office (and out, as well) and he ordered an x-ray of my lungs and when I came back he told of this "walking pneumonia" thing...he told me most people would be in the hospital, with high fever, and he asked me if I felt unwell...and I told him: "Yes, when I am hiking up the Copper Canyon (I had just been there!) at an elevation over 9,000 feet I feel like I don't catch enough air!". I had these coughing fits...I simply had to gasp for air, but besides that I felt just fine!