Of the bacterial group of gram-positive cocci comprising the genera Streptococcus, Enterococcus, and Peptostreptococcus, streptococci constitute the most consequential pathogens of swine. Streptococci are also associated with infectious conditions of humans, cattle, sheep, goats, and horses. Relative to pigs, Vasont.Italic (an alpha-hemolytic Streptococcus) is by far the most important agent of infectious diseases in this group, affecting mainly nursing and recently weaned pigs. Septicemia, meningitis, polyserositis, polyarthritis, and bronchopneumonia are associated with Vasont.Italic infections.