Burkholderia pseudomallei-An Underrecognized Cause of Community-acquired Pneumonia: A Case Series from Central

Anuja George1, Rosmi Jose2, Chithra Valsan3

  • 1Senior Resident, Department of Microbiology, Jubilee Mission Medical College and Research Institute, Thrissur, Kerala, India.

Insights

Melioidosis, an emerging infectious disease caused by Burkholderia pseudomallei, is often underdiagnosed due to its similarity to other lung infections. Early diagnosis and modified antibiotic therapy in high-risk patients are crucial for improving outcomes.

Area of Science:

  • Infectious Diseases
  • Microbiology
  • Pulmonology

Background:

  • Melioidosis, caused by Burkholderia pseudomallei, is an emerging infectious disease with diverse clinical presentations, frequently resembling bacterial pneumonia or tuberculosis.
  • Pulmonary melioidosis is often underdiagnosed due to limited diagnostic facilities and clinical mimicry, particularly in endemic regions like India.

Purpose of the Study:

  • To report culture-confirmed cases of pulmonary melioidosis from central Kerala.
  • To highlight the diagnostic challenges and clinical characteristics of melioidosis in patients with comorbidities.
  • To emphasize the importance of early diagnosis and appropriate antibiotic modification for improving patient outcomes.

Main Methods:

  • Retrospective analysis of 3 culture-confirmed cases of pulmonary melioidosis.
  • Review of clinical presentations, comorbidities, imaging findings, and treatment outcomes.
  • Microbiological confirmation using culture techniques.

Main Results:

  • All 3 patients were diabetic males with multiple comorbidities, including COPD, chronic liver disease, and a history of tuberculosis.
  • Pulmonary melioidosis presented with multifocal lung involvement on imaging, including consolidations, opacities, and cavitary lesions.
  • Despite empirical treatment modification to ceftazidime, 2 out of 3 patients died, indicating the severity of the disease.

Conclusions:

  • Heightened clinical suspicion and robust microbiological support are essential for diagnosing melioidosis, especially in high-risk individuals.
  • Early modification of empirical antibiotic therapy in patients with multifocal pulmonary lesions may improve outcomes and reduce mortality.
  • Melioidosis remains a significant public health concern in endemic areas, necessitating improved diagnostic strategies and timely intervention.

Related Concept Videos

Atypical Pneumonia01:14

Atypical Pneumonia

Atypical pneumonia, often caused by Mycoplasma pneumoniae, is a form of pulmonary infection that differs from the classical presentation of bacterial pneumonia in both its cause and clinical symptoms. Mycoplasma pneumoniae is a pleomorphic bacterium notable for its lack of a rigid cell wall. This structural characteristic imparts resistance to beta-lactam antibiotics and significantly influences the bacterium’s behavior within the human host.Other pathogens responsible for the disease include...
Pneumonia I: Introduction01:29

Pneumonia I: Introduction

Pneumonia is an infection of the lower respiratory tract that leads to inflammation of the lung parenchyma, often resulting in the accumulation of inflammatory exudate in the alveoli and airways. Unlike the watery, low-protein fluid exudate in pulmonary edema, the exudate in this case is a thick fluid rich in immune cells, proteins, and debris produced during infection and inflammation.This impairs gas exchange and can lead to consolidation of lung tissue. The infection may be caused by a...
Pneumonia I: Introduction01:30

Pneumonia I: Introduction

Pneumonia is an acute respiratory infection that targets the lungs, specifically the alveoli. These tiny air sacs, essential for oxygen exchange, become engorged with pus and fluid, severely hindering breathing, decreasing oxygen absorption, and causing significant pain and discomfort during respiration.
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...
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...
Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...
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...