include chronic obstructive pulmonary disease, asthma, bronchiectasis, hypersensitivity pneumonitis, and pneumonia. prevention inhalants disease caused by exposure to industrial inhalants and burn pits can be prevented with the use of engineering controls (e.g., exhaust hoods or closed systems), personal protective equipment, monitoring of potentially affected personnel, worker education and training. transplant the primary prevention of bronchiolitis obliterans in people who have received either lung transplant or hsct therapy is immunosuppression. in regards to post lung transplantation, the combination of calcineurin inhibitor combined with a purine synthesis inhibitor and a glucocorticoid is the general regimen used. people also have a baseline post-transplant lung function testing done in order to determine if their lung function is declining over time. people who are post-hsct their immunosuppressive regimen typically includes methotrexate in combination with a calcineurin inhibitor to prevent gvhd, a risk factor for developing bronchiolitis obliterans. treatment while the disease is not reversible, treatments can slow further worsening. this may include the use of corticosteroids or immunosuppressive medication which may have an effect on the ability to receive a lung transplant if offered. if patients have difficulty breathing (hypoxemia) oxygen can be supplemented. routine vaccinations are recommended for patients with chronic lung disease to prevent complications from secondary infections due to pneumonia and influenza. transplant recipients are at risk for re-developing the disease, as bronchiolitis obliterans is a form of chronic rejection. evaluation of interventions for its prevention relies on early detection of abnormal spirometry results or unusual decreases in repeated measurements. terminology "bronchiolitis obliterans" was originally a term used by pathologists to describe two patterns of airway disease, the other was bronchiolitis obliterans organizing pneumonia (boop), now known as cryptogenic organizing pneumonia. the name cryptogenic bronchiolitis obliterans is used when a cause is unknown. bronchiolitis obliterans when it occurs following a lung transplant is known as bronchiolitis obliterans syndrome (bos). bos is defined as a person who has had either a hsct or lung transplant and develops symptoms or radiographic findings consistent with bronchiolitis obliterans, but has not been confirmed by biopsy.