This idea has been knocking around for a a few days, and is regularly discussed by David Dobbs at his blog. This concerns me quite a bit, as my wife is 8 months pregnant, flu is a very serious risk for pregnant women and their babies, she teaches in a high school, and got her seasonal flu shot last week. It’s called the Hoskins effect and it seems to happen now and then with viruses.
Here’s the story: There is a study coming out of Canada, done in Canada, that seems to show that in Canada people who get the seasonal flu shot have an increased, perhaps doubled, chance of getting H1N1
The way this would work is like this: If your immune system gets trained to handle a certain infection, it focuses a bit too much on that specific version of the infection and ignores other similar infections. All the soldiers are at the wrong side of the castle, as it were.