SLC35A2 and inclusion conjunctivitis: Recent whole-genome sequence-based studies have shown that although recombination events mean that ompA sequence is not a reliable phylogenetic marker across the species, isolates with ompA sequences that define the trachoma ompA genotypes all fall within a single clade of the C. trachomatis phylogenetic tree that shares a distant common ancestor with one of the two UGT lineages8, 9, 10.