"surrounded on all sides by elephantiasis and other dread diseases"

A case of elephantiasis of the leg; Luzon, the Philippines, 1962
Public DomainA case of elephantiasis of the leg; Luzon, the Philippines, 1962 - Credit: Centers for Disease Control and Prevention, U.S. Department of Health and Human Services
Elephantiasis is a disease that causes thickening of the skin and underlying tissues, especially in the legs and male genitals. Sufferers may see their scrotum swell up to the size of a softball or even a basketball.

It is caused by several different parasitic worms carried by mosquitoes, so it is particularly prevalent in the tropical regions of Africa and portions of the Pacific Ocean where Doc Daneeka does not want to end up.

Treatment with antibiotics and preventive programs have been highly successful, leading to the cautious forecast that such diseases may be eliminated by 2020.