To Evaluate the Efficacy (Immunogenicity) and Safety of Euvichol in Healthy Adults and Children

Inclusion Criteria: 1. Written informed consent to study participation voluntarily provided by an individual or his/her legally acceptable representative. 2. Age of 1 \~ 40 years 3. An individual who can be followed up during the study period and is capable of complying with the study requirements. Exclusion Criteria: 1. History of hypersensitivity reactions to other preventative vaccinations. 2. Immune function disorders including immunodeficiency diseases. 3. An individual thought to have difficulty participating in the study due to severe chronic diseases, based on the judgment of the investigator. 4. 38℃ or higher body temperature measured prior to investigational product dosing. 5. Abdominal pain, nausea, vomiting, or decreased appetite within 24 hours prior to study initiation. 6. Diarrhea or administration of antidiarrheal drugs or antibiotics to treat diarrhea within 1 week prior to study initiation. 7. Other vaccination within 1 week prior to study initiation or planned vaccination during the study. 8. Diarrhea or abdominal pain lasting 2 weeks or longer within 6 months prior to study initiation. 9. Participation in another clinical trial with investigational product dosing within 1 month prior to study initiation. 10. Pregnant or lactating women. 11. An individual thought to have difficulty participating in the study due to other reasons, based on the judgment of the investigator 12. Applicable to the Pivotal study only: history of cholera vaccinations or history of cholera.