In this event, Hepatitus is a must. There are several vaccines for Hep a and Hep B, but Hep C is a concern, and there is no approved vaccine. In this latitude, sure, tet and dip, but also now typhoid, yellow fever and typhus. Go to the state department web site and look at recomended vaccinations for travel to 3rd world tropical countries.
You cannot vaccinate against e-coli, exactly, but there is a vaccine out there, now available only for health care workers, that provides limited protection.
CDC is worried about malaria, for what it's worth.