Some airlines ask passengers to show a valid Yellow fever vaccination certificate before flying to Venezuela. This is not an official entry requirement, however the CDC Yellow fever vaccination recommendation is "for all travellers over 9 months of age travelling to Venezuela, except the northern coastal area. The cities of Caracas and Valencia are not in the endemic zone." A valid measles vaccination certificate may be required to board flights out of the country following a nationwide immunisation program in 2006, but foreign tourists are usually exempted. [Source: Wikitravel]
For better readability of the table, pass into the landscape mode.