Infections occur when foreign invaders take root in the human body. When most people think of infections, they think of bacteria and viruses. These however, are not the only invaders our body has to watch out for - fungi are also able to cause disease in humans. You all may be familiar with mild fungal infections, such as athletes foot and yeast infections. Some fungi however can cause life threatening illnesses. One fungus, Histoplasma capsulatum, is capable of causing severe respiratory infections. Dr. Anita Sil from UCSF chat about how this fungus gets into our body and how we clear it.