I think I saw this headline before, like maybe last year…
If you had a flu shot last fall or winter, you might have learned the hard way that the vaccine didn’t work as well as usual. Now, researchers think they know why: a mutation that enabled some flu viruses to beat the vaccine.
The vaccine conferred only 19% protection, versus as much as 60% in other years.
…flu viruses continually evolve new versions of hemagglutinin that the antibodies don’t recognize.
…scientists with the World Health Organization (WHO) survey the virus strains that are on the loose and then try to forecast which ones will be making people sick when flu season hits
…“It’s very hard to predict what [viral strains] will be circulating the next season,” says viral immunologist Scott Hensley of the Wistar Institute in Philadelphia, Pennsylvania. “It’s a bit of a guessing game.”
…“We are hopeful that this year’s outcome will be better.”
Science| DOI: 10.1126/science.aac6894