“…Eleven articles describe specific cohorts with DS and an additional diagnosis which may give insight into risk factors. Specifically, pneumonia and respiratory infections were described in those: undergoing treatment for DS-AML (Hassler et al, 2016;Kudo et al, 2007;Lehrnbecher et al, 2004), with congenital heart disease (Bush et al, 2018;Layangool et al, 2014;Thompson, McElhinney, Jue, & Hodge, 1999), and those who had undergone orthopedic procedures (Boylan et al, 2016;Lerman, Emans, Hall, & Karlin, 2003;Siemionow, Hansdorfer, Janusz, & Mardjetko, 2017), intestinal surgeries (Buchin, Levy, & Schullinger, 1986;Cairo et al, 2019), or airway procedures (Cockerill, Frisch, Rein, & Orvidas, 2016;Pravit, 2014). Airway anomalies, GERD, and pulmonary hypertension were associated with recurrent pneumonia (Bush et al, 2018;Pravit, 2014;Thompson et al, 1999).…”