There are no
requirements concerning vaccinations for international travel.
Vaccination against Tick borne encephalitis (Ticovac) is recommended
for outdoor stays (hiking, camping) and for professionals in rural
areas especially in the North and the North-East of Poland (Russian and
Byelorussian borders). To guard against traveler's diarrhea (Turista),
it is advisable to avoid the highest risk foods: prepared dishes which
are later eaten cold; seafood, meat, fish which are undercooked or
badly cooked, and raw vegetables as well as fruits you have not peeled
yourself.