If you are concerning the health issue for travel Hong Kong, you are welcome to read those updated information by Health Department of Hong Kong:
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Take care of:
1) Air
In the city heart & by the roadside, dusts & without lot of fresh air may make you feel dizzy; Don’t stay too long next to a busy roadside during busy hours.
2) Food
Pay attention of the hygiene condition when you are enjoying seafood or roadside stall food; Use your common sense & judge; Need to boil or cook through for safe to eat.
3) Sunshine
If you will stay in outside for long especially during sunny daytime, it is good to wear a hat & sunglasses; Bring sunscreen lotion for skin protection & bottle of water for refreshing.