In the early 20th century, immigrants would pass through the island to be checked for any contagious diseases. If they were deemed healthy, they would be granted passage into the United States. However, they could also end up at one of the island's two hospitals — one a more general hospital and one set aside for contagious and infectious diseases.
According to a previous article by Business Insider, the hospital organized people into groups by disease — common ailments included measles, scarlet fever, tuberculosis, mumps, and whooping cough.
Those who were sent to the general hospital were more likely to be cured and gain passage into the US, according to Insider. However, those who were sent to the second hospital were drastically less likely to.