Prospective System Analysis of the Seasonal Influenza Virus Transmissions and Evolution in the City of Basel Basel

Completed

• Conditions: Influenza

• Registration Number: NCT03451656
• Lead Sponsor: University Hospital, Basel, Switzerland

Brief Summary

The project aims to use epidemiological tools to understand the transmission and evolution of influenza viruses at an individual and population level within a small-scale city (Basel) through a combination of experimental, clinical, and mathematical advances. Investigators aim to quantitatively characterize the viral transmission using novel molecular-epidemiological tools based on whole genome sequencing.

Detailed Description

Samples will be collected such as whole blood, serum and DNA, nasopharyngeal swamps to diagnose influenza by polymerase chain reaction (PCR) and to determine colonization rates with Staphylococcus aureus and Streptococcus pneumonia. All samples except the first naso-pharyngeal swab for influenza diagnostics will be stored in a biobank and analysed in batches. Each influenza virus isolate will be sequenced using a "whole genome sequencing" approach. The viral transmission and evolution will be analysed using whole genome data for a detailed molecular and phylogenetic tree analysis, respectively. The epidemiological and geographical data will be incorporated into the phylogenetic model.

Study Timeline

• Study Start: 2016-12-27
• Primary Completion: 2017-04-30
• Study Completion: 2017-04-30
• Study First Submitted: 2018-02-23
• Study First Submitted QC: 2018-03-01
• Study First Posted: 2018-03-02
• Status Verified: 2023-03
• Last Update Submitted: 2023-03-15
• Last Update Posted: 2023-03-16

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 4000

Inclusion Criteria

• Each pediatric or adult patient, which fulfill the World Health Organization (WHO) definition of Influenza like illness.
• The case definition includes an acute respiratory infection with coughing, fever ≥38°C, and start of symptoms within the last 10 days.
• Presentation of the patient with influenza-like illness on the emergency ward of the University Hospital Basel or the University Children Hospital of both Basel or a collaborating private practise.

Exclusion Criteria

• Case definition for influenza like illness is not fulfilled

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Similarity of Influenza viruses	at baseline	Genomic sequencing of single virus of individual patients and comparison of genetic similarity of viruses. Grouping of patients with a same virus - this includes a range of single nucleotide polymorphisms of 0-150 differences inbetween the virus population.