Meningitis and septicemia in a 7-week-old piglet caused by dual streptococcal infection.

A 7-week-old piglet was presented with a 2-hour history of neurological signs progressing to death. Necropsy, bacteriologic culture, and immunohistochemical staining indicated an unusual case of Streptococcus suis-like bacterial meningitis and S. suis type 3 septicemia. Management and control of this important bacterial disease are discussed.