THE REMEDY!
Years ago (40) I live through a 3 month heII after a Trip to Puerto Vallarta. I had insurance in the US, the doctors were FAILURES with their "meds". I had a Columbian friend. She said "Wake up in the morning, no food, no water. Drink a clear liquor, Vodka, Rum, whatever. (If it's not "clear" it has nutrients.) Drink as much as you can, not too fast, until you pass out". Sure enough, after 3 months of hell, in one day, I killed everything.
But, that's just a cure.
THE VACCINE!
Put a flask of clear liquor in your bag. Before you eat streat food, take a shot. After you eat street food, take 2 shots. 10 years in Tijuana. I travel with Vodka.