Figure 1. Flowchart of measurements performed in the study
population
EGEA: Epidemiological study on the Genetics and Environment of Asthma;
IgG: Immunoglobulin G. EGEA1: baseline survey (1991-95). EGEA2: first
follow-up of the EGEA participants (2003-07), about 12.5 years after
EGEA1. Measurements for virus-specific IgG levels were performed by
microarray technology. Unvalidated IgG assessment corresponds to samples
excluded due to the lack of sufficient sample volume.