These are the common disorders that lead to immune suppression and the opportunistic organisms that become invasive in such case .
Neutropenia :
* Cytotoxic drugs
* Agranulocytosis.
* Acute leukaemia.
T cell defect ± B cell defect :
* Lymphoma
* Chronic lymphocytic leukaemia.
* HIV
Disturbed antibody production:
* Chronic lymphocytic leukaemia
* Multiple myeloma.
Organisms ( opportunistic)
Fungal (Aspergillus fumigatus)
C.M.V.
T.B, mycobactrium avium
Pneumocystis carinii, actinomycosis israeli.
Other organisms e.g staph, strept or H. influenza.