You will be given a definition of a task first, then some input of the task.
In this task, a passage will be given and the goal is to identify an event from the passage. An event is defined as a single word representing something that happened, is happening, or may happen. An event can be factual or hypothetical, positive or negative, certain or uncertain. While most events are based on verbs, an event can also be based on a noun (ex. storm, snow, rainfall) or a copula verb (is, was, been, etc.). The event must not be a pronoun or an adjective. For noun events with multiple words, use the last word in the phrase as event.

Passage: Cats, however, are known to be affected by spongiform encephalopathy and at least 75 of them have already died from the feline version of the disease. 
Output:
known