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Updated: Sep 12, 2026

Discovery of New Intracellular Pathogens by Amoebal Coculture and Amoebal Enrichment Approaches
Published on: October 28, 2013
[Human diseases caused by free-living amoebae. II. Primary amebic ++ meningoencephalitis]
1Dpto. Parasitología, Facultad de Farmacia, Universidad Complutense, Madrid.
Abstract:
This revision gives an overall view of the health problems caused by the amoebas of the Naegleria genus, which despite being free-life amoebas, can affect humans, almost always fatally, because they cause a syndrome known as primary amoebian meningoencephalitis, which affects people of all ages and physical condition, and especially those who have a prior history of contacts, even if not exclusive, with fresh waters especially sports-related contacts. Morphological data of the protozoon are given, as well as of the pathology of the illness and the epidemiology, diagnosis, and treatment, plus a table of cases successfully treated around the world to date.
Insights
Naegleria amoebas cause fatal primary amoebic meningoencephalitis in humans, often linked to freshwater activities. This review details the protozoon, illness, and treatment, including successful cases.
Area of Science:
- Microbiology
- Infectious Diseases
- Public Health
Context:
- Naegleria species are free-living amoebas found in warm freshwater environments.
- Infection occurs through nasal contact, particularly during recreational water activities.
- Primary amoebic meningoencephalitis (PAM) is a rare but almost invariably fatal central nervous system infection.
Purpose:
- To provide a comprehensive overview of health problems associated with Naegleria amoebas.
- To detail the morphology, pathology, epidemiology, diagnosis, and treatment of PAM.
- To present a global summary of successfully treated PAM cases.
Summary:
- Naegleria amoebas cause primary amoebic meningoencephalitis (PAM), a severe and often fatal brain infection.
- PAM affects individuals of all ages, with increased risk for those with freshwater contact, especially sports-related.
- The review covers the protozoon's characteristics, disease pathology, epidemiology, diagnostic methods, and treatment strategies.
Impact:
- Highlights the critical need for awareness and preventative measures against Naegleria infections.
- Informs clinicians and public health officials about the diagnosis and management of PAM.
- Contributes to understanding treatment efficacy through a review of successful case reports.
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