The CDC Travel Information site can help you prevent both diseases.
Travelers checks provide personal security and can be replaced.
Also, carry only credit cards you will use on vacation. Cancelling lost or stolen credit cards is inconvenient and sometimes difficult on a vacation. When traveling to a foreign country always consult your Travel Agent regarding required travel documents such as passports, visas and tourist cards. It is a good idea, however, to always carry proof of citizenship, preferably a passport. Pack a photocopy of your passport separately from the original.