Gene expression studies in the conjunctival epithelium of subjects with active trachoma who were heterozygous for a SNP in the transcribed portion of the IL-10 gene found that the haplotype associated with scarring was transcribed more efficiently than the other allele, suggesting that increased expression of IL-10 predisposes to adverse sequelae of Ct infection [74]. Here, IL10 is linked to inclusion conjunctivitis.