Blood Stream Infections, Fever, Parasitic Infections, Salmonella Infections, Salmonella Septicemia
Conditions
Keywords
Proteomics, Rapid Diagnostic Test, Salmonellosis
Brief summary
The IDIS study aims to develop a new rapid diagnostic test for invasive salmonellosis using samples (blood, urine) collected from patients with fever and healthy controls at the Institute of Tropical Medicine (ITM) and collaborating centers. The samples are collected after informed consent and/or assent is given by the participant and are stored in a -80 ⁰C freezer after processing (centrifugation and/or aliquoting). Basic information regarding the patient and the samples are coded and stored in a protected Microsoft Access database. The samples will be shipped to Belgium for proteomic analysis. Identification of Salmonella specific proteins in the samples will hopefully support the development of a rapid diagnostic test. Once this test has been developed, the samples will also be used for validation and evaluation of this test.
Detailed description
The aim of the project is the identification of Salmonella specific proteins that can be detected in samples derived from the host (= humans) during an acute infection. This can support the development of rapid tests to improve the diagnosis of invasive Salmonellosis. The study is taking place at the travel clinic of the Institute of Tropical Medicine in Antwerp, Belgium, and at the Sihanouk Hospital Center of HOPE in Phnom Penh, Cambodia. It is planned to start in 2016 at the Centre Hospitalier de Kingasani in Kinshasa, Democratic Republic of the Congo in collaboration with the Institut National de Recherche Biomédicale in Kinshasa, Democratic Republic of the Congo. The expected number of participants in total is 2500. Patients (children and/or adults) presenting with (a history of) fever are asked permission (informed consent and/or assent) to draw additional blood samples (along with routine care samples, so no need for additional venipuncture), and for the long term storage of these samples (whole blood and plasma) in a freezer together with left-over serum and urine samples. They are also asked permission for the collection of coded data including basic demographic, clinical and laboratory data. Blood for plasma and urine are centrifugated. All samples are aliquoted into cryotubes (coded labelling) before storage in a -80 ⁰C freezer. Depending on the final diagnosis, patients can be divided in 4 groups: 1. Patients for whom blood cultures grew Salmonella species 2. Patients for whom blood cultures did not grow a pathogen 3. Patients for whom blood cultures grew with another pathogen 4. Healthy controls The frozen samples collected in Cambodia and the Democratic Republic of the Congo will be shipped to Belgium. All selection of all the samples collected will undergo proteomic analysis by researchers of the Institute of Tropical Medicine in collaboration with the Vlaams Instituut voor Biotechnologie and coded data related to the samples is shared with these partners. Once this test has been developed, the samples will also be used for validation and evaluation of this test.
Interventions
OTHERBlood sampling
Blood sampling (Volume depending on age, minimum 2.0 ml, maximum 10.9 ml extra)
Sponsors
Sihanouk Hospital Center of HOPE
Institut National de Recherche Biomédicale. Kinshasa, République Démocratique du Congo
Vlaams Instituut voor Biotechnologie
Institute of Tropical Medicine, Belgium
Study design
Observational model
CASE_CONTROL
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
2 Months to No maximum
Healthy volunteers
Yes
Inclusion criteria
A. Travel clinic Institute of Tropical Medicine (ITM) Antwerp Inclusion Criteria: Adults (≥ 18 years) and children aged 3 years to 18 years with (suspicion of) fever and: 1. presenting at ITM travel clinic with history of fever (axillary T° ≥ 38°C) and/or chills/rigor and sweats within 3 days prior to consultation 2. presenting at ITM travel clinic for routine check-up (apparently healthy) 3. with recent (\< 2 weeks) stay in tropical country
Exclusion criteria
Refusal to participate B. Sihanouk Hospital Center of HOPE (SHCH) Inclusion Criteria: Adults (≥ 18 years) with (suspicion of) fever and: 1\. Presenting at the in- and outpatient department of SHCH with a history of fever (axillary T≥ 38°C) and/or/chills/rigor and sweats within 3 days prior to consultation
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Detection of bacterial proteins through Selected Reaction Monitoring (SRM) measured in the unit m/z | 2 years | Detection of bacterial proteins in the collected urine and blood samples through Selected Reaction Monitoring (SRM) measured in the unit m/z (whereby m = the atomic mass and z = the charge of the ion) |
| Quantification of bacterial proteins measured through Selected Reaction Monitoring (SRM) as ion counts | 2 years | Quantification of bacterial proteins measured through Selected Reaction Monitoring (SRM) as ion counts in the collected urine and blood samples |
| Ranking of detected bacterial proteins based on detection per number of samples and on ion counts | 2 years | Ranking of detected bacterial proteins based on: * Detection of bacterial proteins per number of Salmonella positive and Salmonella negative urine and blood samples * Protein abundance measured as ion counts |
| Colorimetric detection of the selected proteins by ELISA measured in the unit optical density | 2 years | Colorimetric detection of the selected proteins by ELISA measured in the unit optical density (OD) and expressed as percentage present in Salmonella positive and Salmonella negative urine and blood samples |
| Integration of the selected proteins into a rapid diagnostic test based on a lateral flow format | 4 years | — |
| Evaluation of the test expressed as percentage positive in samples | 4 years | Evaluation of the test on the collected blood and urine samples expressed as percentage positive in Salmonella positive and Salmonella negative samples |
Countries
Belgium, Cambodia, Democratic Republic of the Congo
Outcome results
None listed