Health
Reference only, not medical advice. Drink bottled/treated water, choose food cooked hot, and be cautious with raw foods. Mosquito-borne dengue is a year-round concern; malaria risk is mainly rural and absent from major cities listed by CDC. Use repellent, screened/AC rooms, sun protection, and heat hydration. Avoid floodwater and unsafe freshwater; high-altitude issues are usually limited to mountain treks such as Fansipan/Sa Pa.
Vaccinations
Consult a doctor or travel clinic at least 1 month before travel. Be current on routine vaccines such as MMR, Tdap, polio, flu, varicella/shingles as applicable, plus COVID-19. CDC recommends hepatitis A and B for unvaccinated travelers, typhoid for most travelers, and considers Japanese encephalitis for longer/rural stays and rabies for animal-exposure or limited-care access risks. Malaria prevention may be advised for some rural provinces. Yellow fever vaccine is not recommended and not required for entry by CDC.
eSIM / connectivity
eSIM is broadly workable for visitors with an unlocked, compatible phone. Major local networks include Viettel, VinaPhone, and MobiFone; they and resellers offer prepaid/tourist data options, with passport registration often required for local SIM/eSIM activation. Coverage is strongest in cities and tourist corridors; check rural mountains, border areas, islands, and whether the plan is data-only before buying.
Health/vaccine info is reference only, not medical advice — consult a doctor or travel clinic; defer to CDC/WHO and official sources (as of 2026-06-20).