Several putative tropism loci relating with respect to ocular or UGT infections have been previously described, such as ompA (Andersson et al., 2016), the trp operon (Caldwell et al., 2003), tarp (Lutter et al., 2010), pmp (Carlson et al., 2005; Andersson et al., 2016), cytotoxin (Carlson et al., 2004), and the plasmid (Seth-Smith et al., 2009). Here, TARP is linked to infection.