Primary amebic meningoencephalitis--Georgia, 2002

    Insights

    A fatal case of primary amebic meningoencephalitis (PAM) caused by Naegleria fowleri occurred in an 11-year-old boy after swimming. Health officials advised avoiding the river during high temperatures and low water levels to prevent further infections.

    Area of Science:

    • Infectious Disease Epidemiology
    • Public Health Surveillance
    • Environmental Health

    Background:

    • Primary amebic meningoencephalitis (PAM) is a rare and almost always fatal infection.
    • Naegleria fowleri is a free-living ameba found in warm freshwater environments.
    • Infection typically occurs when contaminated water enters the nasal passages.

    Observation:

    • A case of PAM was reported in an 11-year-old boy in Georgia in September 2002.
    • The boy had recently swum in a local river before falling ill.
    • The Georgia Division of Public Health and CDC investigated the fatal case.

    Findings:

    • The investigation confirmed Naegleria fowleri as the causative agent of PAM.
    • The identified risk factor was swimming in the local river.
    • The case highlights the potential for Naegleria fowleri transmission in recreational waters.

    Implications:

    • Public health recommendations were issued to avoid swimming in the affected river.
    • Advice focused on avoiding water entry into the nose during high temperatures and low water levels.
    • This case underscores the importance of public awareness regarding Naegleria fowleri risks in warm freshwater.

    Related Concept Videos

    Encephalitis l: Introduction01:19

    Encephalitis l: Introduction

    Encephalitis is inflammation of the brain parenchyma, most often due to infections or autoimmune processes. It presents with neuropsychiatric features such as fever, altered mental status, behavioral changes, cognitive dysfunction, seizures, focal deficits, and sometimes autonomic instability. In some cases, the meninges are also involved, resulting in meningoencephalitis.Infectious CausesInfectious encephalitis is most commonly viral but can also result from bacterial, fungal, or parasitic...
    Encephalitis ll: Pathophysiology01:26

    Encephalitis ll: Pathophysiology

    Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
    Bacterial Meningitis I: Introduction01:22

    Bacterial Meningitis I: Introduction

    Bacterial meningitis is a severe, life-threatening inflammation of the meninges, particularly the pia mater and arachnoid mater, affecting the subarachnoid space, ventricles, and cerebrospinal fluid (CSF). If untreated, it can lead to significant neurological complications or death.Causative AgentsCommon pathogens vary with age and immune status. In adults, major organisms include Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae. Streptococcus agalactiae (group B...
    Viral Meningitis01:18

    Viral Meningitis

    Viral meningitis is the most common form of meningitis and is often referred to as aseptic meningitis to indicate the absence of bacterial involvement. It is generally milder than bacterial meningitis, with symptoms including fever, headache, stiff neck, drowsiness, nausea, photophobia, and vomiting. Rarely, more severe manifestations or death may occur. Common causative agents include enteroviruses, particularly coxsackie A and B viruses and echoviruses, all members of the Enterovirus genus...
    Amebiasis01:28

    Amebiasis

    Entamoeba histolytica, a protozoan parasite, is responsible for intestinal and extraintestinal amebiasis. Though a significant proportion of infections remain asymptomatic, approximately 50 million individuals annually are estimated to present with clinical disease, resulting in up to 100,000 deaths globally. The disease burden is disproportionately high in regions with lower socioeconomic status, such as parts of India, Africa, Mexico, and Latin America.Etiology and TransmissionThe infective...
    Bacterial Meningitis II: Pathophysiology01:26

    Bacterial Meningitis II: Pathophysiology

    Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...