A medical definition of histoplasmosis will sound something like this, “A rare lung infection, which is the result of breathing Histoplasma capsulatum fungal spores.” The elements that cause the specific disease are spread in the specific regions of the world, meaning not the entire population may catch this infection. In most cases, the responsible elements are in the soil. However, the flying species of animals like bats and specific birds may be the carriers as well.