In the bivariate analysis between the factors and TLR9 polymorphisms, carriers of a TLR9 variant genotype (CT or CC) had a lower risk of ataxia (OR, 0.22; 95% Cl, 0.06–0.84; p = 0.029) and other neurological sequelae (OR, 0.15; 95% Cl, 0.02–1.26; p = 0.049) at the time of discharge. This evidence concerns the gene TLR9 and Ataxia.