Here's a "Flu for Travelers" site -
https://www.cdc.gov/flu/school-busin...elersfacts.htm
I've been to "international travel medical preparation" companies a few times (company paid - quite pricey), who provide recommendations and innoculations based on travel plans. I've received Hep A/B/C, Polio, Typhoid, etc., etc., based on where I'm traveling, but have never received anything other than the standard US flu shot. They do ask, and recommend, one, but when I tell them I got one locally, they don't make other recommendations, so I assume the US shot is about your only option.