 "Aspergillus" hyphae tend to have dichotomous branching that is progressive and primarily at acute angles of around 45°.People who are immunocompromised — such as patients undergoing hematopoietic stem cell transplantation, chemotherapy for leukaemia, or AIDS — are at an increased risk for invasive aspergillosis infections.These people may have neutropenia or corticoid-induced immunosuppression as a result of medical treatments.