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Flu Shots

The Wall Street Journal of September 24, 2009 reports on a study in the current issue of the New England Journal of Medicine dealing with the efficacy of flu shots during the “2007-2008 flu season.” There were “1952 healthy adults who received either a placebo or one of two [types of] vaccinations,” either a shot or a spray.

“Of the 813 volunteers who received the flu shot, 28 of them or 3.4%, later developed a confirmed case of influenza. In the FluMist group; 56 of the 814 volunteers, or 6.9% developed the flu, while 10.8% of the placebo group had confirmed flu cases.”

Discussion

1. Here is the Minitab output for the comparison between the two forms of vaccination:

Test and CI for Two Proportions

Sample
X
N
Sample p
1
56
814
0.068796
2
28
813
0.034440