Patient With Influenza Like Illness
Conditions
Keywords
Influenza, Vaccination rate, Hospital acquired infection
Brief summary
Hospital acquired influenza is associated with significant morbidity and mortality in hospitalized patients notably elderly patients. Vaccination of HCW is recommended to prevent influenza transmission in healthcare setting. Outbreaks of hospital acquired influenza were reported in stays with high vaccine coverage in patients (higher than 85%). It is necessary to underline that an adequate vaccine cover in the elderly population will not necessarily result in a total control of the incidence. Consequently, the prevention of influenza outbreaks in this vulnerable population must also include the reduction of the exposure to the influenza viruses, in particular thanks to the vaccination of HCW. A pilote case-control study, implemented in Edouard Herriot hospital (at Lyon University hospitals), indicates that a shielding effect of more than 35% of vaccinated HCW on hospital acquired influenza among patients (Bénet et al.; BMC Infectious Diseases 2012). The results suggest a protective effect but investigations, carried out on a more important sample are needed to validate the benefit of HCW vaccination. The aim of this prospective multicentric cohort study is to estimate incidence of influenza among hospitalized patients according to % of influenza vaccination of HCW in short stay units.
Interventions
BIOLOGICALA nasal swab
A nasal swab was performed by a research assistant and influenza virus infection was confirmed by enzyme-linked immunosorbent assay and reverse transcription-polymerase chain reaction on viral cultures
Sponsors
Hospices Civils de Lyon
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
PREVENTION
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
* All adults patients and healthcare workers of the participating units * With Influenza Like Illness
Exclusion criteria
* Patients aged \< 18 years
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Incidence of influenza among hospitalized patients according to % of influenza vaccination of HCW in short stay units | After 16 months (2 influenza seasons: from 15 December 2013 to 15 April 2014 and from 15 December 2014 to 15 April 2015) | Study participation was proposed to each patient who presented ILI (influenza like illness) at admission or during hospitalization. ILI was defined as fever \>37.8°C or cough or sore throat. Vaccination against influenza during the ILI season was collected by oral interview. After the interview, a nasal swab was performed by a research assistant and influenza virus infection was confirmed by enzyme-linked immunosorbent assay and reverse transcription-polymerase chain reaction on viral cultures. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Estimation of influenza vaccine failure according to serotyping of viral strains | After 16 months (2 influenza seasons: from 15 December 2013 to 15 April 2014 and from 15 December 2014 to 15 April 2015) | strains of confirmed influenza virus were analysed by reverse transcription-polymerase chain reaction on viral cultures. |
| Does incidence of community influenza influence hospital acquired influenza infections | After 16 months (2 influenza seasons: from 15 December 2013 to 15 April 2014 and from 15 December 2014 to 15 April 2015) | comparison of results observed during the 2 seasons |
Countries
France
Outcome results
None listed