What causes pulmonary fungal infection?

Pulmonary fungal infection is caused by fungi pulmonary infectious diseases, fungi are widespread in the environment, for fungal infection, generally opportunistic infection, the body immunity is relatively strong people, even if exposed to fungi, is not easy to be infected. But when the body immunity is low, there may be fungal infection. For example, for people who take oral corticosteroids for a long time, the probability of lung fungal infection is higher than normal people. For example, for organ transplant patients, due to the need for oral immunosuppressants, this situation will also cause a decline in the body's immunity, resulting in fungal infection of the lungs. In addition, patients with granulocytosis and hIv infection will cause a decline in immunity, resulting in an increased risk of fungal infection.