You may have heard of a head cold well now scientists have found the foot cold. A recent case study published in Pediatric Rheumatology Online Journal describes a 12-year-old girl who developed influenza B virus infection. Her condition was diagnosed by typical symptoms and detection of the virus in a nasopharyngeal swab by culture and Polymerase chain reaction (PCR). Two weeks after she developed the flue an otherwise unexplained transient oligoarthritis of small joints of the left foot presented. Scientists concluded the influenza virus may be a hitherto underappreciated cause of a post-infectious arthritis.
Bruck N, Gahr M, Pessler F. 2010 Transient oligoarthritis of the lower extremity following influenza B virus infection: Case report. Pediatric Rheumatology Online Journal. 2010 Jan 14;8:4.