Visit Your Travel Clinic 6–8 Weeks Before Departure
The most important piece of advice in this entire article is the timing: see a travel medicine specialist or your GP 6–8 weeks before your South America departure. This lead time is required for two reasons. First, some vaccines (hepatitis A and B, typhoid, yellow fever) require multiple doses 4 weeks apart to achieve full protection. Second, some vaccines (Japanese encephalitis, rabies) require a 3-dose course over 28 days. Leaving this until 2 weeks before departure means you cannot complete the courses. Use the NHS Fit for Travel website (UK), CDC Traveler's Health website (US), or Smartraveller (Australia) for country-specific current recommendations before your appointment.
Yellow Fever Vaccine South America: The Critical One
Yellow fever is both the most important and most complicated vaccine for South America travel. The disease is transmitted by mosquitoes in tropical jungle areas of South America — primarily the Amazon Rainforest basin (Brazil, Peru, Bolivia, Colombia, Ecuador, and Venezuela). The yellow fever vaccine is: required by law for entry to some countries when arriving from certain other countries (the rules are complex and change — check current requirements for your specific itinerary); strongly recommended for all travellers visiting Amazon jungle areas; and a single-dose vaccine that provides lifetime immunity (the WHO revised its recommendation from 10-year boosters to lifetime immunity in 2016). Get it. If your itinerary includes any Amazon region — even a day trip from Manaus or Iquitos — the yellow fever vaccine is non-negotiable.
Hepatitis A South America Travel
Hepatitis A is transmitted through contaminated food and water and is present throughout South America at higher rates than Western Europe and North America. The vaccine is a 2-dose course (second dose 6–12 months after the first) providing at least 25 years of protection. The first dose alone provides good protection for most travel. Strongly recommended for all South America travel, particularly for travellers visiting rural areas, eating street food, or spending extended time in the region. Combined with hepatitis B in the Twinrix vaccine — most travel clinics will recommend this combination.
Typhoid Vaccine
Typhoid is transmitted through contaminated food and water. The risk is higher in rural South America than in major tourist cities but present throughout the continent. Vaccine options: oral (Vivotif — 3–4 capsules on alternate days, 1 week before travel, protection for 3–5 years); injectable (Typhim Vi — single injection, protection for 2–3 years). Both are widely available from travel clinics. Recommended for all South America travel.
Malaria Prophylaxis
Malaria is present in parts of the Amazon basin (Brazil, Peru, Bolivia, Colombia, Venezuela) and in certain rural areas of Ecuador and Guyana. It is not present in the main tourist destinations: Lima, Cusco, Bogotá, Buenos Aires, Santiago, Cartagena, or any city at altitude. If your itinerary includes Amazon jungle stays, consult your travel doctor about prophylaxis — atovaquone/proguanil (Malarone) or doxycycline are the standard options. Malarone must be started 2 days before entering a malaria zone and taken for 7 days after leaving; doxycycline must be started 2 days before and taken for 4 weeks after. Both are effective; your doctor will advise based on your specific itinerary and medical history.
CDC Recommendations Summary
Routine vaccines (up to date): MMR, diphtheria-tetanus-pertussis, varicella, influenza. Recommended for most travellers: hepatitis A, typhoid, yellow fever (if applicable). Consider for specific itineraries: hepatitis B, rabies (pre-exposure for remote travel, animal contact risk), malaria prophylaxis (Amazon itineraries). Check current recommendations at the CDC Traveler's Health website (wwwnc.cdc.gov/travel) for your specific countries and activities.
