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Veterinarians have observed meningoencephalitis in animals infected with listeriosis, caused by the pathogenic bacteria L. monocytogenes. Meningitis and encephalitis already present in the brain or spinal cord of an animal may form simultaneously into meningeoencephalitis. [6] The bacterium commonly targets the sensitive structures of the brain ...
Naegleriasis, also known as primary amoebic meningoencephalitis (PAM), is an almost invariably fatal infection of the brain by the free-living unicellular eukaryote Naegleria fowleri. Symptoms are meningitis-like and include headache , fever , nausea , vomiting , a stiff neck , confusion , hallucinations and seizures . [ 6 ]
The disease most often manifests as meningitis, encephalitis or meningoencephalitis. Myelitis and spinal paralysis also occurs. In about one third of cases sequelae, predominantly cognitive dysfunction, persist for a year or more. [1] The number of reported cases has been increasing in most countries. [2]
Encephalitis with meningitis is known as meningoencephalitis, while encephalitis with involvement of the spinal cord is known as encephalomyelitis. [2] The word is from Ancient Greek ἐγκέφαλος, enképhalos 'brain', [37] composed of ἐν, en, 'in' and κεφαλή, kephalé, 'head', and the medical suffix -itis 'inflammation'. [38]
[3] [8] Meningitis can lead to serious long-term consequences such as deafness, epilepsy, hydrocephalus, or cognitive deficits, especially if not treated quickly. [2] [3] In 2019, meningitis was diagnosed in about 7.7 million people worldwide, [9] of whom 236,000 died, down from 433,000 deaths in 1990. [9]
Herpes meningitis is typically self-limiting over 2 weeks without treatment. However, empirical use of antiviral medications such as acyclovir are considered in cases of suspected HSV meningitis to prevent progression to the more rapid and fatal HSV meningoencephalitis. [7] HSV-2 is the most common herpes virus that causes meningitis. [3]
Viral meningitis, also known as aseptic meningitis, is a type of meningitis due to a viral infection. It results in inflammation of the meninges (the membranes covering the brain and spinal cord). Symptoms commonly include headache, fever, sensitivity to light and neck stiffness. [1] Viruses are the most common cause of aseptic meningitis.
[6] [2] Other signs associated with chronic meningitis include altered mental status or confusion, and papillary edema (swelling of the optic disc). [2] The headache in chronic meningitis is commonly described as diffuse, poorly localized, and constant. Lethargy is a common symptom, with 40% of those having mental status changes. [2]