When cases of keratitis were stratified on the basis of severity (sterile plus mild versus moderate plus severe), the people carrying the minor alleles in IL6 rs1800795 or rs1800797 and people with the heterologous or homologous minor genotype in these SNPs were more likely to have a moderate/severe event, whereas people carrying the dominant haplotype in the IL6 SNPs were less likely to have a severe event [64]. This evidence concerns the gene IL6 and keratitis.