Pyogenic Brain Abscess Caused by Peptostreptococcus in a Patient with HIV-1 Infection

Area of Science:

• Neurology
• Infectious Diseases
• Microbiology

Background:

• Cerebral lesions in HIV patients are typically lymphoma or opportunistic infections.
• In HIV patients with CD4 counts > 200 cells/uL, pyogenic brain abscesses become more relevant.
• Staphylococcus, Streptococcus, and Peptostreptococcus are common causes of brain abscess in immunocompetent individuals.

Observation:

• A 43-year-old HIV-infected patient with a CD4 count of 350 cells/uL presented with a brain abscess.
• The abscess was presumed to be a Peptostreptococcus infection, potentially from an odontogenic source via hematogenous spread.
• This represents a rare instance of Peptostreptococcus brain abscess in an HIV-infected individual.

Findings:

• The patient received treatment including stereotactic needle aspiration and four weeks of intravenous antibiotics.
• Complete resolution of the Peptostreptococcus brain abscess was achieved.
• This case underscores the potential for Peptostreptococcus to cause brain abscess in HIV patients with preserved CD4 counts.

Implications:

• Highlights the importance of considering pyogenic brain abscesses, including those caused by Peptostreptococcus, in HIV patients even with CD4 counts above 200 cells/uL.
• Emphasizes the necessity of a multidisciplinary approach for diagnosing and effectively treating brain abscesses in HIV-1 patients.
• Suggests further investigation into the incidence and management of Peptostreptococcus brain abscesses in the context of HIV infection.