A group of Canadian travelers were visiting the island of Kauai in Hawaii for a summer vacation. They noticed a cave in the middle of the island that contained a 10-foot deep pool of water. Much to their surprise, they were the only individuals enjoying this newly discovered swimming hole. A few days later, all swimmers became ill. Their physician believed they all had Weil's disease. Which of the following organisms could cause this disease?

a. Chlamydia trachomatis
b. Treponema pallidum
c. Borrelia burgdorferi
d. Leptospira interrogans

Weil disease, or Leptospirosis, can be caused by the bacterium Leptospira interrogans. It may have been present in the water the travelers swam in, thus causing their illness.

Explanation:

The organism that could cause Weil disease, also known as Leptospirosis, among Canadian travelers is Leptospira interrogans. This bacterium is typically found in environments with stagnant, warm, and damp conditions, like the cave described in Hawaii. Humans can contract the disease when they come into contact with water or soil contaminated by the urine of infected animals. Hence, the swimmers likely became ill after swimming in the pool of water, which possibly contained Leptospira due to the presence of infected animals in the area. thus, option D is correct answer.

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