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(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.

(in respect of infectious disease other than the

above :-

if there is a case on board.

(3) A vessel or aircraft shall be regarded as Vessels or "suspected"-

(a) in respect of plague -

(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.

aircraft when regarded as suspected.

aircraft

(4) A vessel or aircraft shall be regarded as "contact" if Vessels or it has come from or been in contact with an infected port when and has not been granted free pratique in Hong Kong.

regarded

as contact.

incubation.

3. The period of incubation for the purposes of this Duration of Ordinance shall be five days in the case of cholera, six days period of in the case of plague or yellow fever, twelve days in the case of typhus and fourteen days in the case of smallpox.

of release

4.-(1) Any person liable to be subjected to surveillance Conditions shall, as a condition of being exempted from quarantine, give from quar- a written undertaking to a Health Officer to attend and submit antine of to daily examination at such place and at such time as such persons liable Health Officer shall appoint.

to be

subjected to surveillance.

(2) The undertaking shall be in the form in Schedule A. 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.

from quar-

5.-(1) A Health Officer may require that any contact Conditions liable to be detained in quarantine shall, as a condition of of release being released from quarantine for the period for which he is antine of 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

contacts.