Risk and Distribution of Metastatic Infections by Primary Infection Focus in Staphylococcus aureus Bacteremia.

Area of Science:

• Infectious Diseases
• Clinical Microbiology
• Epidemiology

Background:

• Staphylococcus aureus bacteremia (SAB) is a major cause of illness and death, often leading to metastatic infections.
• Identifying patterns in metastatic infection timing and location based on the primary infection source is vital for effective patient management.
• This research aims to guide clinicians in prioritizing surveillance and interventions for patients at high risk of developing metastatic infections from SAB.

Purpose of the Study:

• To investigate the incidence and distribution of metastatic infections in patients with Staphylococcus aureus bacteremia (SAB).
• To identify temporal patterns and primary infection foci associated with the development of metastatic infections.
• To provide data that can inform targeted clinical management strategies for SAB patients.

Main Methods:

• A retrospective cohort study involving 1725 patients diagnosed with SAB.
• Analysis of metastatic infection incidence and distribution.
• Stratification of data by time post-SAB diagnosis and primary infection focus.

Main Results:

• Of 1725 patients, 289 (16.7%) developed 439 metastatic infections within 90 days.
• Approximately 85% of metastatic infections occurred within the first 7 days post-diagnosis.
• Metastatic infection incidence was highest with endocarditis (73.4%). Common metastatic sites included the lung (23.7%), bones/joints (16.8%), and CNS (12.3%).
• The distribution of metastatic sites varied significantly based on the primary SAB focus.

Conclusions:

• Findings highlight the critical importance of timing and primary infection focus in SAB metastatic infections.
• Results enable a more proactive and targeted approach for managing patients with SAB.
• Clinicians can use this data to optimize surveillance and intervention strategies for high-risk patients.