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That’s right: This year’s flu vaccine is an unusually poor match to the prevalent viruses. As it turns out, about half of the most common strain is a new sub-variation that the existing vaccine is not very effective against, and, since it only showed up in the U.S. this September, scientists were unable to adapt the vaccine in time. Unfortunately, the CDC’s only solution is to recommend taking Tamiflu liberally and early, without waiting for flu test results.
