From Longman Dictionary of Contemporary Englisha bout of depression/flu/sickness etca bout of depression/flu/sickness etcPERIOD OF TIMEa short period of time during which you suffer from an illness → bout
Examples from the Corpus
a bout of depression/flu/sickness etc• Pablo Fernandez was suddenly stricken by a bout of flu.• Occasionally we all suffer from influenza or a bout of sickness, which naturally results in a drop in weight. 