Opportunistic free-living amoebal pathogens

Area of Science:

• Medical Microbiology
• Infectious Diseases
• Public Health

Background:

• Pathogenic free-living amoebae (FLA) cause severe central nervous system infections like granulomatous amoebic encephalitis (GAE) and primary amoebic meningoencephalitis (PAM).
• While immunocompromised individuals are at higher risk, some FLA, such as Naegleria fowleri and Balamuthia mandrillaris, can affect immunocompetent hosts.
• Acanthamoeba species primarily infect immunocompromised individuals but also cause sight-threatening keratitis in contact lens wearers.

Purpose of the Study:

• To describe the epidemiology, clinical presentation, diagnostic methods, and management strategies for infections caused by pathogenic free-living amoebae.
• To highlight the emerging public health concern of FLA detection in water supplies, exacerbated by global warming.

Main Methods:

• Review of epidemiological data on FLA infections.
• Description of clinical manifestations and diagnostic approaches.
• Summary of current treatment and management guidelines.

Main Results:

• FLA infections, though rare, pose significant risks, affecting both vulnerable and healthy populations.
• Naegleria fowleri and Balamuthia mandrillaris can cause fatal CNS diseases.
• Acanthamoeba infections present as GAE or ocular disease.

Conclusions:

• Pathogenic FLA represent a critical threat, necessitating increased awareness and surveillance.
• The presence of FLA in water systems and the impact of climate change warrant urgent public health attention.
• Comprehensive understanding and timely intervention are crucial for managing these rare but deadly infections.