Neurotropic threat characterization of Burkholderia pseudomallei strains

Area of Science:

• Infectious Diseases
• Microbiology
• Neuroscience

Background:

• Neurologic melioidosis has a high mortality rate.
• The specific Burkholderia pseudomallei strains and infection routes that lead to central nervous system involvement are not well understood.

Purpose of the Study:

• To investigate whether particular B. pseudomallei strains are more prone to causing central nervous system infections.
• To determine if the route of infection impacts the neurotropic potential of B. pseudomallei.

Main Methods:

• Comparison of virulence and dissemination of Australian clinical B. pseudomallei isolates.
• Intranasal and subcutaneous infection models in mice.
• Isolates were obtained from patients with neurologic and nonneurologic melioidosis (October 1989–October 2012).

Main Results:

• Neurotropism was not a unique characteristic of B. pseudomallei isolates from neurologic melioidosis patients.
• A specific subset of B. pseudomallei strains demonstrated heightened potential for rapid dissemination to multiple tissues, including the CNS.
• This dissemination occurred irrespective of the initial infection route (intranasal or subcutaneous).

Conclusions:

• The pathogenic potential for severe melioidosis, including CNS invasion, is linked to specific B. pseudomallei strains rather than the clinical presentation of the initial infection.
• These findings have significant public health implications for early and appropriate treatment strategies following exposure to invasive B. pseudomallei.
• Further research into B. pseudomallei pathology can reduce morbidity and mortality associated with this disease.