[Source: The Lancet Infectious Diseases, full page: (LINK). Summary.]
Methodological evolution of influenza vaccine effectiveness assessment
James E Fielding
Published Online: 06 April 2016 / Article has an altmetric score of 10 / DOI: http://dx.doi.org/10.1016/S1473-3099(16)00155-9
Over the last 10 years, the case test-negative study (or test-negative design) has emerged as the preferred observational study design from which to calculate influenza vaccine effectiveness (VE). From humble beginnings as a sentinel physician pilot project in Canada in 2004–05,1 it is now used as far afield as China,2 South Africa,3 and Central America.4 It is a prospective variant of the traditional case-control study design, in which the case (test positive) or control (test negative) status of the study participants is not known at the time of their recruitment into the study: patients presenting with a defined acute respiratory illness are tested for influenza and those who test positive become cases and those who test negative become controls.
Keywords: Research; Abstracts; Seasonal Influenza; Vaccines.