The same FUT2 variant is known to have an impact on several infections: non-secretors are protected against norovirus and rotavirus but are at higher risk of infection with other pathogens, including, e.g., Candida albicans, Streptococcus pneumoniae, and mumps (Thorven et al. 2005; Greenberg and Estes 2009; Ruvoën-Clouet, Belliot, and Le Pendu 2013; Imbert-Marcille et al. 2014; Tian et al. 2017; Azad, Wade, and Timpson 2018). This evidence concerns the gene FUT2 and infection.