Background Reliable estimates of the effectiveness of influenza vaccine among persons 65
years of age and older are important for informed vaccination policies and programs. Short …

Background Influenza-related morbidity and mortality have been extensively studied with
hospital and reimbursement data. However, little is known about the effectiveness of the …

Background. The effectiveness of influenza vaccination against hospitalization and death
can only ethically be assessed in observational studies. A concern is that individuals who …

Background Numerous observational studies have reported that seniors who receive
influenza vaccine are at substantially lower risk of death and hospitalization during the …

Background Despite recommendations for annual vaccination against influenza, more than
half of elderly Americans do not receive this vaccine. In a serial cohort study, we assessed …

ContextAlthough large-scale observational studies have demonstrated the effectiveness of
influenza vaccination, no large studies have systematically addressed the clinical benefit of …

Objective: Each year, influenza and its complications account for 10,000-40,000 excess
deaths in the United States. Over 80% of these deaths occur among the elderly. The …

Objective: To quantify the protective efficacy of influenza vaccine in elderly persons. Data
Sources: A MEDLINE search was done using the index terms influenza vaccine, vaccine …

OBJECTIVE: To estimate influenza vaccine effectiveness (VE) in preventing hospitalizations
in persons over 50 years of age. DESIGN: We performed a retrospective, population based …

Background Influenza vaccination has been shown to reduce morbidity and mortality in the
older adult population. In Canada, vaccination rates remain suboptimal. We identified factors …