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Why choose the four-strain (quadrivalent) vaccine?

The four-strain vaccine offers better protection by adding a fourth influenza virus strain. It in fact offers protection against four different strains of the influenza virus: two influenza A strains and two influenza B strains (compared to two A strains and only one B strain with the three-strain, or trivalent, vaccine).

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Did you know that...?

  • During a Leger Marketing survey conduted from June 29 to July 2, 2015 on influenza vaccines, 61% of the Canadians polled said that the availability of an influenza vaccine covering four strains instead of three would make them more likely to get vaccinated[1].
  • According to the study, it was shown that on average, a person who has the flu (not during the flu season) will miss approximately 14 hours of work, which represents a cumulative loss of 20 work days per 100 full-time employees, for the employer.[2].
  • In2015-2016, the dominant influenza virus strain in Québec was the B/Victoria lineage. However, this strain was not part of the three-strain vaccines administrated during this period, whereas it was part of four-strain vaccines[3].

[1] Léger Marketing. The Research Intelligence Group. Flu Vaccines Survey, June 29-July 2, 2015.
[2] Edward W. Thommes, Morgan Kruse, Michelle Kohli, Rohita Sharma, Stephen G. Noorduyn. Review of seasonal influenza in Canada: Burden of disease and the cost-effectiveness of quadrivalent inactivated influenza vaccines.
[3] Gouvernement du Québec. Le bulletin Flash grippe, september 2016.