Draconic Plague

Haudenosaunee legends from the Onyarekowa clans tell of a great malady that overtook a number of the Onyarekowa before the white men arrived.
  First recorded in Japan in 1609, the Draconic Plague quickly swept across the world over the next quarter century affecting most of the world's dragons. The malady was quickly found to be resistant to Dragon's Blood's purification effects. It arrived in North America prior to 1620, and Europe in 1623. African records seem to indicate that the plague arrived there later than other areas of the world, with the first records showing up in 1633. South and Central America show signs of the plague shortly before North America.    The plague seems to run its cycle over the course of two months. After about 25 years, the plague seemed to die out. Many of the affected dragons succumbed to the plague. Survivors seemed to recover fairly quickly and most of them were left with stronger lungs and cores after the course of the plague. Breeds with breath or spitting effects typically found themselves with stronger abilities and more control over their effects.

Transmission & Vectors

Although it is unconfirmed, the plague is believed to be transmitted via contact with the infected dragon's bodily fluids, especially saliva released in a coughing fit.

Symptoms

The draconic plague is a respiratory illness, typically resulting in a racking cough which affects the dragon severely. Those dragon breeds with breath or spitting powers are affected more greatly due to the cough's likelihood of triggering the effects.

Treatment

Although there is no officially recognized cure, the best treatment seems to be ensuring the dragon maintains their appetite. Dragons who were able to continue eating seem to have maintained their strength against the malady.

Prognosis

Following the onset of the coughing, most of the breeds suffer from a severe lack of appetite due to the racking cough's impact on the muscles of their core.
Type
Bacterial
Origin
Natural
Cycle
Short-term
Rarity
Extremely Rare
Affected Species