OXT and susceptibility to pneumonia measurement: Other causes include surgical procedures, hormone deficiencies (hypopituitarism, hypothyroidism), hormone treatments (vasopressin, desmopressin, oxytocin), HIV, pulmonary conditions (e.g., pneumonia), and central nervous system disorders (CNS) (stroke, hemorrhage, infections, trauma, mental health disorders, and psychosis) [10,11,14,15,16].