You take a dose every other day and if you can keep it in your system for at least 2 hours without vomiting, and do that for at least 3 doses, you're covered. I can see why people opt for a shot. So far so good today though the stomach is off a bit.
This isn't to protect me from the great supposed horrors of Costa Rica but from other travelers who may bring a bug with them from an entirely different country.
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