medical inspection of crew and passengers and the landing and isolation of the sick. Passengers and crew may not move beyond the limits prescribed by the aerodrome authority except with the permission of the visiting medical officer. This restriction may continue to be imposed on the aircraft at each landing place until it arrives at a sanitary aerodrome, where it will be subject to the measures laid down in this chapter.
article 25
Commander’s duties on arrival. The commander of the aircraft is required, on landing, to place himself at the disposal of the sanitary authority, to answer all requests for information affecting public health which are made to him by the competent service, and to produce the aircraft’s papers for examination.
Should an aircraft, on entering a territory, land elsewhere than on a sanitary or authorized aerodrome, the commander of the aircraft shall, if the aircraft comes from an infected local area or is itself infected, notify the nearest local authority to this effect, and the latter shall take such measures as are appropriate to the circumstances, being guided by the general principles on which the present convention is based, and shall, if possible, direct the aircraft to a sanitary aerodrome. No cargo shall be unloaded and no passenger or member of the crew may leave the vicinity of the aircraft without the permission of the competent sanitary authority.
article 26
Replacing surveillance by observation. In the application of the present convention, surveillance may not be replaced by observation except—
(a) in circumstances in which it would not be practicable to carry out surveillance with sufficient thoroughness; or
(b) if the risk of the introduction of infection into the country is considered to be exceptionally serious; or
