H1N1 Spread Linked to Seasonal Flu Shots

Four new studies conducted by Canadian researchers conclude that the traditional seasonal flu vaccine seems to have boosted the risk of infection with pandemic H1N1 swine flu by almost double.

In one study, the researchers revealed to use ongoing sentinel monitoring system in order to assess the frequency of prior vaccination with the seasonal flu vaccine in people suffering from H1N1 swine flu in 2009 compared to people without swine flu.

The study discovered that seasonal flu vaccination was linked with a 68 percent boosted risk of falling in prey to swine flu.


The Canadian sentinel study showed that receipt of TIV in the previous season (autumn 2008) appeared to increase the risk of pH1N1 illness by 1.03- to 2.74-fold, even after adjustment for comorbidities, age, and geography