Complex sentence: Currently, no licensed vaccine targeting "Shigella" exists, though several vaccine candidates for "Shigella" are in various stages of development including live attenuated, conjugate, ribosomal, and proteosome vaccines.
Split into simpler sentences: Currently, no licensed vaccine targeting "Shigella" exists. Several vaccine candidates for "Shigella" are in various stages of development including live attenuated, conjugate, ribosomal, and proteosome vaccines.