postviral syndrome
noun/ˌpəʊstˈvaɪrəl sɪndrəʊm/
/ˌpəʊstˈvaɪrəl sɪndrəʊm/
(also postviral fatigue syndrome)
[uncountable]- a condition that follows a viral infection, in which somebody feels extremely weak and tired, and which can last for a long time
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postviral syndrome