Vessels or aircraft when regarded as suspected.
Vessels or aircraft
when regarded
as contact.
Duration of period of incubation.
Conditions
of release
616
(d) in respect of typhus :-
if it has on arrival or has had during the voyage any case of typhus on board.
(e) in respect of yellow fever :--
(i) if there is a case of yellow fever on board; or
(ii) if there was a case on board at the time of departure or during the voyage.
(f) in respect of infectious disease other than the above
if there is a case on board.
(3) A vessel or aircraft "suspected"-
(a) in respect of plague :--
shall be regarded as
(i) if a case of plague broke out on board in the first six days after embarkation of the person affected; or
(ii) if there has been an unusual mortality on board. among rats the cause of which has not been determined.
(b) in respect of cholera :-
if there has been a case of cholera on board at the time of departure or during the voyage, but no fresh case during the five days previous to arrival.
(c) in respect of yellow fever:--
(i) if having had no case of yellow fever on board it arrives after a voyage of less than six days from an infected port or from a port in close relation with any endemic centre of yellow fever; or
(ii) if having had no case of yellow fever on board it arrives after a voyage of more than six days and there is reason to believe that it may carry winged stegomyia (Aedes Egypti) from any such port.
(4) A vessel or aircraft shall be regarded as "contact" if it has come from or been in contact with an infected port and has not been granted free pratique in Hong Kong.
3. The period of incubation for the purposes of this Ordinance shall be five days in the case of cholera, six days in the case of plague or yellow fever, twelve days in the case of typhus and fourteen days in the case of smallpox.
4.-(1) Any person liable to be subjected to surveillance shall, as a condition of being exempted from quarantine, give a written undertaking to a Health Officer to attend and submit to daily examination at such place and at such time as such subjected to Health Officer shall appoint.
from quar- antine of persons liable to be
surveillance.
Schedule A,
Conditions of release
from quar- antine of contacts.
(2) The undertaking shall be in the form in Schedule A. (3) Every failure to comply with the terms of any such undertaking shall be deemed an offence against this Ordinance.
(4) A Health Officer at his discretion may require the person giving the undertaking to furnish security in a sum not exceeding two hundred dollars for the due execution of the undertaking.
5.-(1) A Health Officer may require that any contact liable to be detained in quarantine shall, as a condition of being released from quarantine for the period for which he is so liable, give a written undertaking :-
(a) to attend and submit daily to examination at such place and at such time as such Health Officer may appoint; and
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