Catriona plague
Catriona, named after the
Nilfgaardian ship that brought it to the
Northern Kingdoms, is a disease which is extremely similar to the
Bubonic plague and is, in fact, the Bubonic plague. It also became known as the Red Death.
History
During her escape from the world of
Aen Elle,
Ciri traveled through the time-space continuum and one of her stops was probably medieval Europe in our world during the plague epidemic in the 14th century. She entered a port town which could be Genoa or some other Mediterranean port. She was immediately repelled by the place because there were the corpses of people and animals lying in the streets.
There were also many burned buildings marked by white crosses and many fleas. She escaped to another point in the time-space continuum, but before she was able to do so, a few fleas stuck to her jacket. Her next stop was another unnamed port town. She was able to discern that the port lays in Nilfgaard. She decided to quickly leave this place as well, but just before the next time-space jump, one of the surviving fleas jumped from her jacket and made itself comfortable on an old sewer-
rat. This rat boarded an old dirty hulk which set sail that very evening for
Cintra. The name of the hulk was Catriona. Later in the Saga, there is small note about a dying tomcat who had caught a rat which left that hulk.
A year after the
Battle of Brenna, the Red Death reached the city of
Maribor, in the largest outbreak of the disease up to that point. Most of the physicians and priests fled the city during the epidemic, likely exacerbating the situation. Among those who stayed were
Milo "Rusty" Vanderbeck and
Iola the Second, who treated the diseased, undeterred by the lack of a cure. They both became infected. Rusty died in Iola's arms, and Iola died alone four days later.