Streptococci are Gram positive cocci in the family Streptococcaceae. They often occur in pairs or chains, especially in fluids. Many members of the genus Streptococcus are pathogenic for humans and animals. Some species are proven or suspected to be zoonotic.
Iowa State University
Iowa State University Center for Food Security and Public Health, "Streptococcosis" (2005). Center for Food Security and Public Health Technical Factsheets. 127.