Prospective study of Streptococcus milleri hepatic abscess

Area of Science:

• Hepatology
• Microbiology
• Infectious Diseases

Background:

• Pyogenic hepatic abscesses are serious infections requiring prompt diagnosis and treatment.
• Biliary disease is a common predisposing factor for liver abscesses.
• Streptococcus milleri is a significant pathogen in hepatic abscess formation.

Purpose of the Study:

• To investigate the characteristics and outcomes of pyogenic hepatic abscesses.
• To identify the common causative agents and sources of hepatic abscesses.
• To highlight the distinct clinical presentation of Streptococcus milleri-induced hepatic abscesses.

Main Methods:

• Prospective study over seven years.
• Microbiological demonstration of pyogenic hepatic abscesses.
• Analysis of clinical data, including symptoms, duration, and causative organisms.

Main Results:

• Thirty-seven cases of pyogenic hepatic abscess were identified.
• Biliary disease was the source in 42% of cases.
• Streptococcus milleri was the most common pathogen (51%), often causing monomicrobial abscesses (79%).
• Streptococcus milleri abscesses presented with a longer duration of symptoms (42 days vs. 11 days).
• Occult hepatic abscess should be considered in 28% of Streptococcus milleri bacteremia cases.
• Empirical therapy included agents effective against Streptococcus milleri.

Conclusions:

• Streptococcus milleri is a distinct cause of pyogenic hepatic abscess with a typically torpid clinical course.
• Early suspicion and targeted therapy are crucial for Streptococcus milleri hepatic abscesses.
• Differentiating Streptococcus milleri from other viridans streptococci is important due to its pathogenic potential.