MMP7 has consistently been found to be upregulated in scarring trachoma and trichiasis alongside MMP9 and MMP12 but there is less evidence for a role of MMP7 in active trachoma (Holland et al., 2010; Burton et al., 2011b, 2015; Hu et al., 2012). The gene discussed is MMP9; the disease is inclusion conjunctivitis.