Diarrhoeal diseases pose a serious global problem, especially in the developing world. Shigella flexneri Y, the most deadly species of Shigella, is endemic in most developing countries. An antibody, SYA/J6, against Shigella flexneri Y was developed. Studies have shown that MDWNMHAA is a weakly immunogenic peptide against the antibody SYA/J6. The research team at Zymeoworks Inc., a computational biotechnology company, is hoping to improve the binding of MDWNMHAA to SYA/J6 in order to generate a more effective immune response. This could lead to a vaccine for Shigella flexneri Y.