| 单词 | fifth disease | 
| 释义 | fifth disease n.  A usually mild disease, primarily of children, that is caused by a parvovirus and is characterized by fever, a prominent, often bright red rash on the cheeks that may spread to the trunk and limbs, and swollen, painful joints. Also called  erythema infectiosum. [From its being fifth in frequency of rash-producing childhood diseases.] | 
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