There is currently no solid recommendation for the need of a booster dose. But the experts following up those who have received the vaccine seems to suggest there may be a need for booster later. 7 yr? 10 yr? 20 yr? Wait and see, keep informed from your family doctor.
I hv called them (HappyCard) in last week and asked for doctor list. they said they can't provide the list to me until I joined in. but you can give them a doctor name and ask if this doctor available in their list or not. however, i hv asked if any 兒科醫生 available in their list. they said only one 兒科醫生available who is located at Mongkok.