- Immune suppression (e.g. advanced Human Immunodeficiency Virus (HIV) with high viral load and low CD4 count, Lupus on immunosuppressants that would increase risk of pneumonia) 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 for pneumonia (e.g. very low BMI, severely malnourished, or very low FEV1) will only be included at the discretion of the investigator.