Health
Reference only, not medical advice. Hong Kong is low altitude; heat, humidity and intense sun are bigger issues, especially May-Oct. Drink treated water, choose busy/clean food stalls, and use normal food-safety care. Mosquito-borne illnesses such as dengue can occur; use repellent and cover up in parks/trails. Avoid floodwater after heavy rain.
Vaccinations
Consult a doctor or travel clinic at least 1 month before travel. CDC advises being up to date on routine vaccines, including MMR, flu, polio, varicella, Tdap, shingles as age-appropriate, plus COVID-19. Hepatitis A is recommended for unvaccinated travelers; hepatitis B and typhoid may be recommended depending on age, itinerary and food plans. Rabies pre-exposure vaccine is usually only for higher-risk animal/outdoor work. Yellow-fever vaccine is not recommended and no certificate is required for Hong Kong.
eSIM / connectivity
eSIM is widely usable in Hong Kong if your phone is unlocked and eSIM-compatible. Major local networks include csl/HKT, 3 Hong Kong, China Mobile Hong Kong and SmarTone; several offer prepaid, tourist SIM, travel data or eSIM-style options through shops, apps or online channels. Hong Kong International Airport, convenience stores and carrier shops are common pickup/activation points; verify passport registration and mainland-roaming needs 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 2026-07-13).