%0 Journal Article %T Chronic obstructive pulmonary disease exacerbation frequency and serum IgG levels %A Donald W. Cameron %A Gonzalo Alvarez %A Juthaporn Cowan %A Sunita Mulpuru %A Vicente Corrales-Medina %J Journal of Allergy and Clinical Immunology %D 2018 %R 10.1016/j.jaci.2017.09.036 %X We compliment Leitao Filho et£¿al1 for their recent publication titled ¡°Serum immunoglobulin G and risk of exacerbations and hospitalizations in chronic obstructive pulmonary disease.¡± Leitao Filho et£¿al1 make a novel contribution to the understanding of the relationship between baseline serum IgG levels and the frequent chronic obstructive pulmonary disease (COPD) exacerbator phenotype. %U https://www.jacionline.org/article/S0091-6749(17)31669-X/abstract