Staphylococcus Aureus Caught in Action at the Site of Infection

University Hospital, Basel, Switzerland100 enrolled

Overview

This study is to obtain a comprehensive view of S. aureus adaptations in the infected human host and (i) to improve the understanding of the interface between antibiotic therapy, resistance development and virulence factor adaptation in S. aureus infected patients, and (ii) to adapt these findings into a more sustainable use of antimicrobials for therapy.

Staphylococcus (S.) aureus is notorious for its ability to develop resistance. This study is to obtain a comprehensive view of S. aureus adaptations in the infected human host and (i) to improve the understanding of the interface between antibiotic therapy, resistance development and virulence factor adaptation in S. aureus infected patients, and (ii) to adapt these findings into a more sustainable use of antimicrobials for therapy. Patients with S. aureus infections who will routinely undergo diagnostic and surgical procedures will be identified. Intraoperative samples from the site of infection during surgery will be taken. Additionally, two blood drawing events (22.5ml in total) will be performed and nose swabs will be taken. The biological material will be analysed. This project will be the first to study different phenotypes of invasive S. aureus directly from its environment in vivo.

Study Type

OBSERVATIONAL

Enrollment

100

Conditions

Staphylococcus (S.) Aureus Infection

Interventions

data collectionOTHER

Health-related personal data such as year of birth, sex, Body Mass Index (BMI), infection classification, concomitant infections, comorbidities according to medical chart, standard diagnostic markers (CRP, blood differential plots, creatinine, ...), medication, treatment start, treatment end and discharge from hospital will be collected.

blood drawDIAGNOSTIC_TEST

2 blood drawing events (in total 22.5 ml) will be performed in the patient. 1 blood drawing events will be performed in the healthy proband.

nose swabsDIAGNOSTIC_TEST

2 nose swabs will be taken in the patient. 1 nose swab will be performed in the healthy proband.

Eligibility

Sex: ALLMin age: 18 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion criteria for patients: * In collaboration with the orthopedic surgeons, patients with probable or proven S. aureus infections will be identified who will routinely undergo diagnostic and surgical procedures: Inclusion criteria for healthy participants: * Healthy control group should be generally well-being Exclusion criteria for patients and for healthy participants: * Pregnancy: Pregnant or lactating women will be excluded (urinary pregnancy test will be performed in women of childbearing age) * General health condition: Current or recurrent disease that could cause complications that may affect the study or may set the patient at risk * Diseases/ Illness: Psychiatric or other mental disorders which in the opinion of the investigator may probably affect the full understanding of the study (including signs of dementia) * Language: Insufficient knowledge of german language to understand the procedure and rationale of the research question * Vulnerability: Individuals whose willingness to volunteer in the research project may be unduly influenced by the expectation, whether justified or not, of benefits associated with participation, such as members of a group with a direct hierarchical structure (refer to ICH Guidelines E6 (R1) for GCP, 1.61)

Locations (1)

University Hospital Basel

Basel, Switzerland

Outcomes

Primary Outcomes

Expression of virulence factors of S. aureus (derived from patient's samples (tissue, nose swab)) by combining highly sensitive mass spectrometry with whole genome sequencing.

Expression of virulence factors of S. aureus (derived from patient's samples (tissue, nose swab)) by combining highly sensitive mass spectrometry with whole genome sequencing. There is neither a primary nor a secondary endpoint in this research project.

Time frame: Project duration for each patient will be two days

Antibiotics concentration

Antibiotics concentration with chromatography methods (in tissue, blood)

Time frame: Project duration for each patient will be two days

Expression of genomic alterations of S. aureus (derived from patient's samples (tissue, nose swab)) by combining highly sensitive mass spectrometry with whole genome sequencing.

Expression of genomic alterations of S. aureus (derived from patient's samples (tissue, nose swab)) by combining highly sensitive mass spectrometry with whole genome sequencing. There is neither a primary nor a secondary endpoint in this research project.

Time frame: Project duration for each patient will be two days

Data from ClinicalTrials.gov

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