Bacterial meningitis in older adults

Diedre Hofinger1, Larry E Davis

  • 1From Internal Medicine and Infectious Disease Service, New Mexico VA Health Care System, 1501 San Pedro Dr. SE, Albuquerque, NM, 87108, USA, dhofinger@salud.unm.edu.

Abstract

Insights

Bacterial meningitis is increasingly affecting older adults, who may not show typical symptoms. Early diagnosis and prompt treatment, considering potential antibiotic resistance, are crucial for better outcomes in this population.

Area of Science:

  • Medicine
  • Infectious Diseases
  • Geriatrics

Background:

  • Bacterial meningitis burden is shifting towards older adults.
  • Older adults may present with atypical symptoms, delaying diagnosis.
  • Healthcare-associated meningitis and resistant organisms pose increased risks in this demographic.

Purpose of the Study:

  • To highlight the changing epidemiology of bacterial meningitis.
  • To emphasize the importance of early suspicion and diagnosis in older adults.
  • To provide guidance on diagnostic and therapeutic strategies for meningitis in the elderly.

Main Methods:

  • This is an opinion statement, not a research study.
  • Recommendations are based on clinical experience and current understanding of bacterial meningitis.
  • Guidance is provided on diagnostic procedures and empiric antibiotic selection.

Main Results:

  • Older adults present unique challenges in meningitis diagnosis and management.
  • Prompt lumbar puncture and appropriate empiric antibiotic therapy are critical.
  • Consideration of antibiotic resistance patterns and adjunctive therapies like dexamethasone is advised.

Conclusions:

  • Clinicians must maintain a high index of suspicion for meningitis in older adults.
  • Timely diagnostic workup, including lumbar puncture, is essential.
  • Empiric antibiotic choice should be guided by patient factors, local resistance, and Gram stain results, with vancomycin often necessary for suspected Streptococcus pneumoniae.

Related Concept Videos

Bacterial Meningitis01:24

Bacterial Meningitis

Bacterial meningitis is a severe infectious disease involving inflammation of the meninges, the protective membranes surrounding the brain and spinal cord. It occurs when pathogenic bacteria cross the blood–brain barrier and enter the cerebrospinal fluid. Common causative organisms include Neisseria meningitidis, Streptococcus pneumoniae, Haemophilus influenzae type b, Listeria monocytogenes, and Escherichia coli K1. The exact route of entry varies by pathogen and host condition.Routes of Entry...
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...
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...
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...
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...
Brain Abscess l: Introduction01:26

Brain Abscess l: Introduction

A brain abscess is a focal, intracerebral infection characterized by a localized collection of pus within the brain parenchyma, resulting from microbial invasion and the body’s inflammatory response. It progresses through stages: early and late cerebritis, followed by early and late capsule formation, reflecting tissue destruction, immune response, and eventual encapsulation.Etiology and PathogenesisCausative organisms vary with source and host factors, often involving polymicrobial infections,...