Echovirus 9 can be associated with acute polyarthritis that may take months to resolve, presenting with mildly inflammatory synovial fluid.
Echovirus 9 may cause prolonged polyarthritis with mildly inflammatory fluid; this case leaves open mechanism and prevalence.
A patient with fever, myalgias, and acute polyarthritis in whom echovirus 9 was isolated from throat and rectal swab specimens is described. All symptoms resolved spontaneously over a one week period except for the arthritis which required three months for complete recovery. A mildly inflammatory synovial fluid and histologic picture were observed. Attempts to isolate the virus from synovial fluid and synovium during acute illness were unsuccessful.
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Blotzer et al. (1978) studied this question.
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