Referencias: 1. Modell V., Knaus M., Modell F. Global overview of primary immunodeficiencies: a report from Jeffrey Modell Centers worldwide focused on diagnosis, treatment, and discovery. Immunol Res. 2014; 60(1):132-44. 2. "Sick All the Time? It Could Be PI." Jeffrey Modell Foundation., 2012. 3. Blaese. IDF Patient Handbook. 4. Bousfiha - 5. "10 Warning Signs of Primary Immunodeficiency." Jeffrey Modell Foundation., 2013. 6. "10 Warning Signs of Primary Immunodeficiency for Adults." Jeffrey Modell Foundation., 2013.