(a) You must not take any of the following actions on the basis that a passenger has a communicable disease or infection, unless one of the conditions of paragraph (b) of this section exists:

(1) Refuse to provide transportation or use of a vessel to the passenger;

(2) Delay the passenger's transportation or use of the vessel (e.g., require the passenger to take a later trip);

(3) Impose on the passenger any condition, restriction, or requirement not imposed on other passengers; or

(4) Require the passenger to provide a medical certificate.

(b) You may take actions listed in paragraph (a) of this section only if either or both of the conditions listed in paragraphs (b)(1) and (2) of this section are met. The action you take must be the least restrictive from the point of view of the passenger, consistent with protecting the health of other passengers.

(1) U.S. or international public health authorities (e.g., the Centers for Disease Control, Public Health Service, World Health Organization) have determined that persons with a particular condition should not be permitted to travel or should travel only under conditions specified by the public health authorities;

(2) An individual has a condition that is both readily transmissible by casual contact in the context of traveling on or using a passenger vessel and has serious health consequences.

Example 1 to paragraph 39.31(b)(2).A passenger has a common cold. This condition is readily transmissible by casual contact but does not have serious health consequences. You may not take any of the actions listed in paragraph (a) of this section. Example 2 to paragraph 39.31(b)(2):A passenger has HIV/AIDS. This condition is not readily transmissible by casual contact but does have serious health consequences. You may not take any of the actions listed in paragraph (a) of this section. Example 3 to paragraph 39.31(b)(2):A passenger has SARS or a norovirus. These conditions are readily transmissible by casual contact and have serious health consequences. You may take an action listed in paragraph (a) of this section. Example 4 to paragraph 39.31(b)(2).A passenger has a condition that is not readily transmissible by casual contact to or does not have serious health consequences for the general passenger population. However, it is possible that it could be readily transmitted by casual contact with and have serious health consequences for an individual with a severe allergy or severely compromised immune system. You may not take any of the actions listed in paragraph (a) of this section.

(c) Any action of those listed in paragraph (a) of this section that you take under paragraph (b) of this section must be the least drastic action you can take to protect the health of other passengers. For example, if you can protect the health of other passenger by imposing a condition on the transportation of a passenger with a communicable disease (e.g., limiting the passenger's access to certain facilities on the vessel for a period of time), you cannot totally deny transportation on the vessel.

(d) For purposes of paragraph (a)(4) of this section, a medical certificate is a written statement from the passenger's physician saying that the passenger's disease or infection would not, under the present conditions in the particular passenger's case, be readily communicable to other persons by casual contact during the normal course of the passenger's transportation or use of the vessel. Such a medical certificate must state any conditions or precautions that would have to be observed to prevent the transmission of the disease or infection to other persons in the normal course of the passenger's transportation on or use of the vessel. It must be sufficiently recent to pertain directly to the communicable disease presented by the passenger at the time the passenger seeks to board the vessel.

(e) If your action under this section results in the postponement of a passenger's transportation or use of the vessel, you must permit the passenger to travel or use the vessel at a later available time (up to one year from the date of the postponed trip or use of the vessel) at the cost that would have applied to the passenger's originally scheduled trip or use of the vessel without penalty or, at the passenger's discretion, provide a refund for any unused transportation or use of the vessel. If there is no available reservation within one year, you must provide a refund.

(f) If you take any action under this section that restricts a passenger's transportation or use of the vessel, you must, on the passenger's request, provide a written explanation within 10 days of the request.