Kongo Bongo Gone Wrongo
Tropical Toucans can be carriers of the disease and can transmit it through bites and pecks, otherwise the origins and background of the disease are a mystery. Its only known cure is the nectar of the rare Tin-Banana-Tu banana, which is a purple species of banana with an extremely foul taste, according to King K. Rool. Also a person can be immune to the disease if they have a very healthy diet, as General Klump mentioned that he rarely gets sick in general due to eating 100 garlic cloves a day: and so is not affected by Krusha's infection.
Cranky created a vaccine from the banana and gave the vaccine to his fellow Kongs. But after Diddy Kong tricks Cranky Kong by using two coconuts, the treacherous Polly Roger infects Diddy by pecking his rump. Afterwards, Diddy spreads the disease to Krusha, who then spreads it to King K. Rool, both via sneezing. Fortunately, thanks to Donkey Kong, the three victims are cured before the disease completes its final stages.
The disease is also likened to influenza when Candy says it's "like having [that disease], times one hundred and two".
Symptoms Song Screenshots