ADH secretion is stimulated by numerous factors and clinical states including pre/post-operative patients, fever, pain/stress, respiratory distress/failure, head trauma, CNS infections, pneumonia, bronchiolitis, hypovolemic states, and exposure to some medications (opiates, SSRIs, NSAIDs, Phenothiazines) (38, 41). This evidence concerns the gene AVP and susceptibility to pneumonia measurement.