[FaceKicker]

What's wrong with 80% effectiveness? I didn't know anything about the effectiveness of vaccines, but 80% effective struck me as being 'pretty good'. I looked up the effectiveness of flu vaccines for comparison, and found a source [1] that said it varies in effectiveness from 70 to 90%, so just about the same.

I've never felt compelled to be more careless after taking a vaccine (I'm not even sure what I'd do differently if I did); I just get vaccines to minimize the expected number of times I get a disease in my lifetime.

[1] http://www.webmd.com/vaccines/how-effective-is-flu-vaccine