Influenza vaccination of individuals with persistent asthma (ages 5-45 years)
Individuals who received a seasonal influenza vaccination (numerator), among Individuals with persistent asthma aged 5-45 (denominator)
Influenza (flu) is a common, contagious respiratory illness caused by influenza viruses, and may result in serious complications or death . Vaccination has been shown to reduce flu-related hospitalizations by up to 71% . Seasonal influenza vaccination is recommended by the Israeli Ministry of Health for all individuals (above the age of 6 months), and in particular for children, the elderly, and individuals with chronic conditions, including asthma, as Influenza contributes to asthma exacerbations. .
Individuals in the denominator who received a seasonal influenza vaccination (September 1st to February 28th)
Individuals with persistent asthma aged 5-45
 Centers for Disease Control and Prevention (CDC). 2013. “Seasonal Influenza: Flu Basics”. Available: http://www.cdc.gov/flu/about/disease/index.htm
 Talbot, H.K., Y. Zhu, Q. Chen, J.V. Williams, M.G. Thompson, M.R. Griffin. “Effectiveness of Influenza Vaccine for Preventing Laboratory Confirmed Influenza Hospitalizations in Adults, 2011–2012 Influenza Season.” Clinical Infectious Diseases 2013, 56(12):1774–7.
 In Hebrew:תדריך חיסונים 1999. האגף לאפידמיולוגיה, משרד הבריאות. עדכון 2017. Available: https://www.health.gov.il/UnitsOffice/HD/PH/epidemiology/td/docs/tadrich_Chisunim.pdf [Accessed: 21-March-2018]