Definition of negative (CT value or related) for passenger arrived by air at Hong Kong International Airport and DH administrated locations

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Dear Department of Health,

1) Can you please elaborate the definition as negative of COVID for passenger arrived by air at Hong Kong International Airport, information such as their CT value and test mechanism, data range from 2020 until now ?

2) Does DH administrate the discharge value for our public hospital, and the definition as negative of COVID, information such as their CT value and test mechanism, data range from 2020 until now ?

3) For those DH administrated department (such as out patient clinic) - what is the definition as negative of COVID, information such as their CT value and test mechanism, data range from 2020 until now ?

4) What is the definition as negative of COVID for passenger departing Hong Kong International Airport to Mainland China, information such as their CT value and test mechanism?

5) What is the definition as negative of COVID for passenger departing Hong Kong using land / surface route access Mainland China, information such as their CT value and test mechanism?

Yours faithfully,
Asif