Nominally significant (i.e. P values without correction for multiple testing) allelic associations were observed for 2 SNPs at ABCA4 (rs2997633, rs3112831) and 1 SNP at COL2A1 (rs2276455) when affected children (i.e. children with retinal or brain disease or both) in the EMSCOT cohort were compared with infected but unaffected children (Table 1). Here, COL2A1 is linked to brain disorder.