Histoplasmosis is a fungal disease found in the lungs of humans. This disease is triggered by a specific fungus called Histoplasma capsulatum which is most commonly found in soil, dusts polluted with the excretions of birds and animals.

Although most of the people affected with this fungus remain unaware of their disease, as it does not show any symptoms in its primary forms. They may, however, face minor symptoms, also observed in flu infection, like dry cough, chest pain and fever. This disease is common among farmers, painters, roofers and more whose job profile demands contacts with the polluted soil. An outbreak of this disease is specially observed among a group of people after paying a visit to cave like area which is rich in bat droppings. This disease is also known as bird-fancier's disease as it can affect mammals like dogs and cats, apart from humans.

 In this disease, the mycelial phase rich in spores and mycelia fragments reach the lung alveoli after their inhalation. This disease then multiplies and spreads to other living cells of the body. It is observed that the greater the exposure of the person to spores, the more susceptible the person would be of developing this symptomatic disease.