Putman B, Lahousse L, Zeig-Owens R, et al. - Since the link of low IgA with longitudinal lung function is inadequately defined, researchers addressed this topic in this study performed on 917 World Trade Center (WTC)-exposed firefighters. The participants had longitudinal spirometry measured between September 2001 and September 2018. In these individuals, IgA was measured between October 2001 and March 2002. Findings revealed lower forced expiratory volume in 1 s (FEV₁) % predicted in the year after 11 September 2001, enhanced risk of FEV₁/FVC < 0.70 and increased antibiotic treatment, in correlation with low IgA vs IgA > 70 mg/dL. After WTC exposure, worse lung function and increased antibiotic treatment were reported in relation to early IgA ≤ 70 mg/dL.