FUT2 and ear infection: The FUT2 stop variant c.461G>A (p.Trp154*; rs601338) has been associated with multiple mucosal phenotypes and is in strong linkage disequilibrium (LD) with a synonymous FUT2 variant rs681343 that was previously associated with childhood ear infections in genome-wide association studies (GWAS) (Pickrell et al., 2016; Tian et al., 2017).