- Risk Factors for Pneumonia: immune suppression (e.g. Human immunodeficiency virus [HIV], Lupus) or other risk factors for pneumonia (e.g. neurological disorders affecting control of the upper airway, such as Parkinson's Disease, Myasthenia Gravis). Subjects at potentially high risk (e.g. very low Body mass index [BMI], severely malnourished, or very low FEV1) will only be included at the discretion of the investigator.