In adults, infection could spread from MG1 to the FG, MG2, and MG3 from previously infected tissues such as ligaments that connect at the junction of the FG and MG1, by cell-to-cell movement through midgut epithelial cells and/or midgut muscle cells (Nagata et al., 1999; Kritzman et al., 2002). The gene discussed is MUC5B; the disease is infection.