Infectious Disease - A type of illness caused by a pathogenic agent, including viruses, bacteria, fungi, protozoa, parasites, or abnormal proteins known as prions.⏎
Meningeal Infection - An infection of the protective membranes that cover the brain and spinal cord, known collectively as the meninges.⏎
Immune System - The system of biological structures and processes that protects the body from foreign substances, including pathogens.⏎
Morbidity - The relative occurrence of a disease or a condition that causes illness.⏎