Many Streptococcus suis isolates from porcine endocarditis in slaughterhouses have lost their capsule and are considered avirulent. However, we retrieved capsule- and virulence-recovered S. suis after in vivo passages of a nonencapsulated strain in mice, suggesting that nonencapsulated S. suis are still potentially hazardous for persons in the swine industry.
Ahead of Print -Streptococcus suis Serotype 2 Capsule In Vivo - Volume 22, Number 10—October 2016 - Emerging Infectious Disease journal - CDC
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