Cholera and travelers' diarrhea are now less likely with a non us approved but world accepted oral vaccine.
The Vaccine prevents travelers' diarrhea caused by enterotoxigenic E. coli (ETEC) and cholera in adults and children 2 years of age and older. It is recommended for people traveling to areas with a high risk of cholera or travelers' diarrhea.

I want you to be very aware that one must still be cautious not to become contaminated with dirty water or spoiled food or
other unclean practices leading to exposure for diarrhea as prevention is still important.

This vaccine works by introducing very small amounts of dead [killed vs live] cholera bacteria and nontoxic components of cholera toxin into the body. This allows the body to make antibodies against the bacteria and toxin so that if the bacteria does get into the body and produce the toxin, they are immediately attacked by the body's own defense system. The cholera toxin is very similar to the toxin produced by ETEC, the bacteria that causes most cases of traveler's diarrhea. Therefore, the body's defenses against cholera toxin will also work against the ETEC toxin.  It generally takes one week after finishing the first course of immunization for the body's defenses to develop protection against the bacteria.
02247208 din [drug identification number]  DUKORAL SUSPENSION made by Crucell  in the UK

Use with caution if:
  You are on a controlled-sodium diet (each dose contains 1.1 g sodium).

Not to be used if:
  Allergy to formaldehyde.
  Acute feverish illness (you should not take the vaccine until you have recovered).
  Acute stomach or intestinal illness (you should not take the vaccine until you have recovered).
  Dukoral vaccine is not recommended for children under two years of age, as its effectiveness has not been studied in this age group.