Tuesday, March 18, 2008

Influenza and Pneumococcal Polysaccharide Immunization Amongst Adult Canadians; A Progress Report

Anna-Maria Frescura, Samina Aziz, Lisa Belzak, and Mahnaz FarhengMehr. Immunization and Respiratory Infections division, Public Health Agency of Canada, Ottawa, ON, Canada

Learning Objectives for this Presentation:
By the end of the presentation participants will be able to learn about changes in coverage over time in for influenza and pneumococcal polysaccharide vaccines among Canadian adults.

In 2006 the Public Health Agency of Canada conducted a National Immunization Coverage Survey to assess coverage rates for a select number of adult immunizations, including influenza and pneumococcal polysaccharide vaccines.

See Learning objectives

A random digit dialling telephone survey was conducted between April 29th and July 4th, 2006 on a sample of non-institutionalised adult Canadians 18 years and older. Coverage rates were reported by antigen for the general population and for NACI (National Advisory Committee on Immunization) recommended target groups.
Descriptive analysis was performed to obtain frequencies for each antigen by target group and regression analysis used to assess predictors of influenza and pneumococcal polysaccharide uptake.

The overall response rate for this survey was 12% (n=2237). Influenza coverage by target group was: 69.9% (5.8) for seniors, 38.2% (4.9) for adults 18-64 years with CMC and 64% 2.9 for HCW. Pneumococcal polysaccharide vaccine coverage was 38.2% 4.9 for seniors and 16.7% 4.6 for adults 18-64yrs with a CMC.
Since 2001, coverage has increased significantly for influenza in the general population (2001: 32.7% 2006: 37.3%) and for HCW in close contact with patients (2001: 54.8% 2006: 69.9%).
Predictors of influenza uptake in the general population include: being over 65yrs (Odds Ratio: 8.1), working or volunteering in a health care setting (OR:2.5), receiving a recommendation from a physician (OR:11.9) and having at least one chronic medical condition (OR:1.4).

Influenza immunization estimates have increased since 2001 for HCW and, the general population, but have remained similar over time for other target groups. Immunization uptake can be increased by encouraging HCW to recommend vaccination to their clients and through public education.