Streptococcus suis serotype 2 is a major swine pathogen mainly associated with meningitis, although other systemic infections have been described streptococcus suis is now emerging as a threat to human health, especially in Asian countries where it has recently been identified as the leading cause of adult meningitis in Vietnam, the second in Thailand, and the third in Hong Kong . Moreover, two important human outbreaks of streptococcal toxic shock-like syndrome (STSLS) due to Streptococcus suis occurred in China during the last years with a fatality rate near 20%