Abstract
Infections caused by Streptococcus suis are an important economic problem in the swine industry. Moreover, S. suis (especially serotype 2) is an agent of zoonosis that has the potential to afflict those who are in close contact with infected pigs or pork-derived products. Although sporadic cases of S. suis infections in humans have been reported during the last 40 years, a large outbreak occurred in China in 2005. The severity of the infection in humans during the outbreak, such as clinical signs of streptococcal toxic shock syndrome, attracted much attention from the scientific community and the public press. In part I of this article, the general characteristics of the organism were reviewed, as well as the clinical characteristics associated with S. suis infection in humans, the pathogenesis of infection and associated virulence factors, and finally, the interactions between S. suis and the host's immune system. Part II of this series focuses on the epidemiology of S. suis infections in humans, as well as a discussion of the possible explanations to account for the geographic differences in human infections caused by this organism.
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