The CDC and WHO recommend the following vaccinations for Costa Rica: hepatitis A, hepatitis B, typhoid, yellow fever, rabies, meningitis, polio, measles, mumps and rubella (MMR), Tdap (tetanus, diphtheria and pertussis), chickenpox, shingles, pneumonia and influenza. Recommended for travelers to most regions.
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The mosquitoes that spread Zika usually do not live at altitudes above 6,500 feet because of environmental conditions. Although there is a risk of Zika in Costa Rica, travelers whose itineraries are limited to areas above this altitude are at minimal risk of getting Zika from a mosquito.
Country Summary: While petty crime is the predominant threat for tourists in Costa Rica, violent crime, including armed robbery, homicide and sexual assault, occurs in Costa Rica.
CDC recommends that travelers going to certain areas of Costa Rica take prescription medicine to prevent malaria. Depending on the medicine you take, you will need to start taking this medicine multiple days before your trip, as well as during and after your trip.
There are no specific vaccine requirements for entry into Bali, however there are a number of factors to consider when deciding whether or not to take precautions and get vaccinated against diseases prevalent in Bali and surrounding South East Asian countries including Indonesia.
Extra things for ThailandMalaria prevention tablets may be recommended for persons travelling to areas remote from the usual tourist areas. You will not usually need malaria pills for areas such as Bangkok, Chiang Mai, Phuket or Koh Samui.