Multiple Hepatic Abscess from Parvimonas micra: An Emerging Gastrointestinal Microbe

Area of Science:

• Microbiology
• Infectious Diseases
• Hepatology

Background:

• Parvimonas micra is an anaerobic bacterium commonly found in the human oral cavity and gastrointestinal tract.
• While generally commensal, P. micra has been increasingly recognized in various systemic infections.
• Infections caused by P. micra outside the oral cavity are uncommon, and hepatic involvement has not been previously documented.

Observation:

• A 90-year-old female patient presented with multiple hepatic abscesses.
• Diagnostic investigations identified Parvimonas micra as the causative pathogen.
• This represents the first reported case of P. micra-induced hepatic abscess.

Findings:

• The study details a rare case of hepatic abscess caused by Parvimonas micra.
• The bacterium, usually a commensal, demonstrated pathogenic potential in this elderly patient.
• Identification of P. micra in hepatic abscesses expands the spectrum of its clinical manifestations.

Implications:

• This case broadens the understanding of Parvimonas micra's pathogenic capabilities.
• It suggests that P. micra should be considered in the differential diagnosis of hepatic abscesses, particularly in elderly or immunocompromised individuals.
• Further research is warranted to elucidate the mechanisms underlying P. micra's translocation and virulence in hepatic infections.