1. If the declared cough is asymptomatic, and there is no history of contact with other infectious diseases or suspected medical records, it will usually not be refused entry. However, the ImmD will conduct assessment and investigation according to the specific circumstances, and may request further medical examination or isolation if it deems it necessary.
2. If the declared cough has symptoms, or has a history of other infectious diseases or suspected diseases, it may be refused entry. The Immigration Department will conduct assessment and investigation according to the specific circumstances, and may request further medical examination or isolation if necessary.
In short, when you return to Hong Kong, if you declare a cough, you should truthfully fill out the health declaration form, detailing the symptoms and other relevant information. If further medical examination or isolation is required, it shall actively cooperate and execute as required.