episode

Reader's Digest 4月号の記事 'Surprisingly Ordinary Allergy Triggers' からの抜粋です。
Stress
...
While the study did not prove a cause-and-effect relationship, stress is known to exacerbate many health problems and allergies appear to be among them. "While alleviating stress won't cure allergies, it may help decrease the episode of intense symptons," said the study's author, Amber Patterson, MD.
"episode" は日本語にもなっていますが、病気にも使われるとは？　辞書を見ます。
・Oxford English Dictionary: A finite period in which someone is affected by a specified illness.: acute psychotic episodes: Asthma was defined by a past history of at least three episodes of wheezing.
・Collins Dictionary: An episode of an illness is short period in which a person who suffers from it is affected by it particularly badly.: The new drug lessens the severity of pneumonia episodes.