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Fever Year (First Pass)
Fire lizard illness (First Pass/First Interval)
The Plague (Second Interval)
The Plague in the Second Interval spread across all of Pern. The dragonriders had to keep themselves apart from the Holds and Halls so their weyrfolk would not catch the Plague. The dragonriders did provide food and supplies by air drop.
Dragon Plague (Second Interval/Third Pass)
Flu pandemic (Sixth Pass)
To be completely accurate, the Second Interval disease should be referred to as a flu pandemic - instead of a Plague - and the Sixth Pass disease should be referred to as a Plague - instead of a flu pandemic.
That is because 'Plague' is an infectious disease that affects humans and other mammals, such as the feline in the Sixth Pass, which was known to be the source. 'Flu', on the other hand, is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and sometimes the lungs, often with no known source.