Catriona is a disease which is extremely similar to the bubonic plague.
In The Witcher computer game
Glossary Entry
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Catriona
"A disease which quickly spread through all the northern countries after the war with Nilfgaard. Those who suffer from catriona die a terrible death - their convulsions become stronger each day, they vomit blood and mucus, and have bloody diarrhea. After a fortnight or so they die in agony." |
St. Lebioda's Hospital in the Temple Quarter of Vizima is filled with the victims of Catriona, and Shani spends her time trying to help them in Acts II and III. She probably works in the hospital during Act IV, as well, but Geralt is no longer in Vizima.
According to the old women in the Outskirts, when the plague first came, the first to go were the cats and dogs, then the rats and finally the people. Apparently, the lack of food even drove some of the more desperate to cannibalistic and necrophagic acts and many ghouls were created as a result.
cs:Catriona hu:Catriona ru:Катриона