Streptococcus suis has recently re-emerged as a significant cause of increased mortality in piglets and growing pigs. Non-disease-causing commensal S. suis strains normally reside in the upper respiratory tracts of pigs while pathogenic strains cause meningitis, arthritis, endocarditis, polyserositis and septicemia. S. suis can also act as an opportunistic pathogen, causing respiratory disease in the presence of other bacterial or viral pathogens. Due to differences in the pathogenicity of S. suis strains, diagnosing and selecting the correct strain for vaccine development can be difficult. In addition, multiple pathogenic types exist, and vaccination with one pathogenic strain may not lead to cross-protection for other pathogenic strains. [Source: 20190409NHF-001_978&sfvc4enews=42&cl=article_1&utm_rid=CPG02000003679044&utm_campaign=37549&utm_medium=email&elq2=8ef07b40b1e947f6926af8dc9c87643c” target=”_blank”>National Hog Farmer.