Meningitis: Inflammation of the meninges, with both mental and motor symptoms.
Sepsis: Infection with disease-causing microorganisms or other toxins in the bloodstream.
Streptococcus: The most common disease-causing bacteria in humans, which can be treated with antibiotics. If left untreated, some types of streptococcal bacteria may give rise to more serious diseases.
Immunization: The creation of immunity by introducing antigens into the body in order to stimulate the development of immunity.