Meningitis is an inflammation of the protective membranes covering the brain and spinal cord, known as the meninges. It can be caused by various infectious agents, including viruses, bacteria, and fungi, as well as non-infectious causes.
Down syndrome is a genetic disorder caused by the presence of an extra chromosome 21, leading to three copies of this chromosome instead of the usual two. However, it seems like you might be referring to something specific with “.3Down Syndrome” that isn’t immediately clear from standard medical terminology.