回复：友情提醒要去南美洲的朋友们 -yellow fever vaccination.

Based on cdc's website, it's not required to get yellow fever vaccination to go to Peru. Although it's recommended to get it if you are traveling to the areas east of the Andes Mountains (see Map 4-16). Travelers who are limiting travel to the cities of Cuzco and Machu Picchu do not need vaccination. Peru recommends vaccination for those who intend to visit any jungle areas of the country <2,300 m (<7,546 ft.).

http://wwwn.cdc.gov/travel/yellowBookCh5-MalariaYellowFeverTable.aspx