Introduction
Salmonella enterica includes more than 2500 serovars and represents a major food-borne pathogen, which mainly causes gastroenteritis. However, focal suppurative infections of almost any organ may occur and produced different characteristic clinical syndromes (Lombardi et al., 2014; Galanakis et al., 2007). Meningitis is diagnosed in less than 1% of clinical salmonellosis; Salmonella infections account for 0.8% of all cases of osteomyelitis. Salmonellainfection also causes abscesses, including intra-abdominal infections, spontaneous peritonitis, splenic abscess, and knee joint infections (Ispahani et al., 2000). Many non-typhoid Salmonella serotypes, including S. Enteritidis, S. Typhi, S. Typhimurium,S. Newport, S. Choleraesuis, S. OhiO, and S.Virchow, have been reported to be the causing factor in osteomyelitis or septic arthritis in humans (Salem, 2014; McAnearney et al., 2015; Kato et al., 2012; Weston et al., 2015; Katsoulis et al., 2004; Sy et al., 2013; Morgan et al., 1990). S. Virchow has also been connected with meningitis in adults (Lombardi et al., 2014). In this study, the first Chinese case of infection in the knee joint by S. Virchow monophasic variant (Salmonella 6,7,14 :r:-) is reported; this novel serovariant without the fljAB operon was identified by whole-genome sequencing analysis.