Prevention of Influenza and Other Wintertime Respiratory Viruses Among Healthcare Professionals in Israel

NCT ID: NCT03331991

Last Updated: 2024-07-31

Basic Information

• Recruitment Status: COMPLETED
• Total Enrollment: 2400 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2016-09-28
• Study Completion Date: 2019-07-31

Brief Summary

The purpose of the study on the Prevention of Influenza and Other Wintertime Respiratory Viruses among Healthcare Professionals in Israel Effectiveness of Influenza Vaccine in Preventing Influenza Virus Infection, Missed Work, and Patient Exposure: A Prospective Cohort Study of Healthcare Personnel (to be called the Healthcare Personnel or HCP study throughout this Data Security Plan) is to investigate vaccine effectiveness and respiratory illness among healthcare personnel (HCP). This will help to better understand the factors that influence influenza vaccination choice, individual vaccine response, and whether or not the influenza vaccine helps to prevent influenza in HCP.

Detailed Description

Healthcare personnel (HCP) are believed to be at increased risk of influenza infection and often work while ill, which increases the risk of secondary exposure to vulnerable patients. Vaccination of HCP against influenza is an important component of infection control in healthcare settings, but persistently low rates of vaccine uptake among HCP remains a topic of international concern and debate. Although recent reviews confirm that the seasonal influenza vaccine is moderately effective in reducing the risk of influenza illness [10], multiple gaps in knowledge remain regarding the preventive value of vaccine among HCP.

During at least two consecutive influenza seasons or years, this prospective cohort study of healthcare personnel in middle-income countries has four primary objectives: (1) Describe the frequency and impact of acute respiratory illnesses (ARI) among HCP during wintertime; (2) Estimate the effectiveness of influenza vaccine in preventing symptomatic influenza illness, missed work due to influenza illness, and hours of direct patient care provided by HCP with symptomatic influenza infections; (3) Examine the association between repeated influenza vaccination and HCP's baseline immune landscape, their response to influenza vaccines, and their subsequent protection against infection; (4) Examine if influenza vaccine modifies symptom severity and duration among HCP with breakthrough influenza infections despite vaccination.

Approximately 2,400-2,800 HCP providing direct patient care will be enrolled in a prospective cohort to be followed for at least two years (or two influenza seasons). In Israel, approximately 1,200 HCPs will be enrolled in Year 1 of the study, with an expansion to full enrollment in Year 2. Thus, the investigators anticipate a 3 year cohort study in which ~1,200 participants will contribute to years 1 and 2 of the study and the remaining sample will contribute to years 2 and 3 of the study. Information on socio-demographic characteristics, current medical conditions, medical history, medical care utilization, and influenza vaccination history will be extracted from medical and employee records with the participant's permission. Other information on socio-demographics, occupational responsibilities, health status, and knowledge and attitudes about viruses and vaccines will be collected by self-report through an enrollment survey. Collection of blood specimens will occur prior to and after influenza seasons during each study year; in addition, HCP who receive the influenza vaccine will provide an additional blood draw 21-42 days after vaccination. Active surveillance to identify acute illnesses (associated with cough, runny nose, body aches, or feverishness) will occur twice-weekly during weeks of local influenza circulation. When an acute illness is identified, participants will provide a respiratory specimen (nasal self-swab) for influenza testing and complete two brief surveys during and after resolution of their illness. For a sub-sample of consented participants, additional information on attitudes toward morbidity with influenza and respiratory illness will be collected through in-depth qualitative interviews. Additional brief surveys will be completed at the end of each season/year and at the start of the second influenza season to update information on participant health, work responsibilities, and attitudes and practices associated with vaccination and other inflection control and prevention measures.

Conditions

Respiratory Tract Disease; Influenza

Study Design

• Observational Model Type: COHORT
• Study Time Perspective: PROSPECTIVE

Interventions

influenza vaccine

exposure to influenza vaccine

Intervention Type: BIOLOGICAL

Eligibility Criteria

Inclusion Criteria

• Be aged ≥18 years old;
• Work at the facility full-time (≥30 hours per week);
• Have routine direct hands-on or face-to-face contact with patients (within 1 meter) as part of a typical work shift, including, but not limited to, physicians, nurses, respiratory therapists, physical therapists, unit clerks, radiograph technicians, medical assistants, and transporters;
• Continuous membership in Clalit Health plan for at least 1 year prior to enrollment.

Exclusion Criteria

• No routine direct patient contact;
• Works part-time;
• Already received current season's flu vaccine more than 48 hours before enrollment and, thus, cannot complete blood draw prior to full immune response to the vaccine;
• Not be a member of the Clalit Health System health plan.

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

Centers for Disease Control and Prevention

FED

Sponsor Role: collaborator

Clalit Research Institute

OTHER

Sponsor Role: collaborator

Abt Associates

INDUSTRY

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Mark Thompson, PhD

Role: PRINCIPAL_INVESTIGATOR

Centers for Disease Control and Prevention

Locations

Soroka Medical Center

Beersheba, , Israel

Rabin Medical Center

Petah Tikva, , Israel

Countries

Israel

References

Hirsch A, Katz MA, Laufer Peretz A, Greenberg D, Wendlandt R, Shemer Avni Y, Newes-Adeyi G, Gofer I, Leventer-Roberts M, Davidovitch N, Rosenthal A, Gur-Arie R, Hertz T, Glatman-Freedman A, Monto AS, Azziz-Baumgartner E, Ferdinands JM, Martin ET, Malosh RE, Neyra Quijandria JM, Levine M, Campbell W, Balicer R, Thompson MG; SHIRI workgroup. Study of Healthcare Personnel with Influenza and other Respiratory Viruses in Israel (SHIRI): study protocol. BMC Infect Dis. 2018 Nov 6;18(1):550. doi: 10.1186/s12879-018-3444-7.

Reference Type: DERIVED

PMID: 30400834 (View on PubMed)

Other Identifiers

HHSD2002013M53890B

Identifier Type: -

Identifier Source: org_study_id