Assessment of neopterin and indoleamine 2,3‐dioxygenase activity in patients with seasonal influenza: A pilot study. - Pizzini, Alex; Kurz, Katharina; Santifaller, Janine; Tschurtschenthaler, Christoph; Theurl, Igor; Fuchs, Dietmar; Weiss, Günter; Bellmann‐Weiler, Rosa (Influenza & Other Respiratory Viruses, 2019)