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Rh of the crew be prevented during the same period except for purposes connected with the service.

On condition that the measures provided by the foregoing paragraph are not aggravated, the health authorities may cause the bacteriological examination to be made in so far as it may be necessary.

The health authorities may prohibit turning water ballast off in ports if it has been taken on in a contaminated port, unless it has been previously disinfected.

29. Vessels uninfected with cholera shall be granted pratique immediately, whatever be the nature of their bill of health.

The only measures to which they may be subjected by the health authority of the port of arrival shall be those provided under Nos. 1, 4, and 6 of article 27.

The health authority may forbid letting water ballast off in ports if it has been taken on in a contaminated port, unless it has been previously disinfected.

With regard to the state of their health, the crew and passengers may be subjected to a surveillance not to exceed five days from the date on which the vessel left the contaminated port.

It is recommended that the landing of the crew be forbidden during the same period except for purposes connected with the service.

The competent authority of the port of arrival may always demand an affidavit from the ship's physician or, in the absence of such, from the captain, to the effect that there has not been a case of cholera on board since the vessel sailed.

30. Vessels infected with yellow fever shall be subjected to the following measures:

1. Medical inspection.

2. The patients shall be landed under such conditions that they will be protected from mosquito bites, and duly isolated.

3. The other persons may likewise be landed and subjected, from the date of arrival, to an observation or surveillance not exceeding six days.

4. Vessels shall anchor, as far as possible, at a distance of 200 meters from the shore.

5. If possible, the mosquitoes on board shall be exterminated before the cargo is discharged. If this is impossible, all necessary measures shall be taken in order that the persons employed in discharging the cargo may not be infected. These persons shall be subjected to a surveillance not to exceed six days from the time they cease to work on board.

31. Vessels suspected of yellow fever shall be subjected to the measures indicated under Nos. 1, 4, and 5 of the preceding article.