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Young kids who get all their whooping cough shots on time could become susceptible to the disease again when they're between 8 and 11. Researchers say the immune protection conferred by the current vaccine loses its punch.
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Some 338 people have been infected with whooping cough in Oregon this year. But that's just a small fraction of the number of cases the state of Washington is reporting. Health experts say the booster shot is not 100 percent effective at preventing the disease, but people who have it are far less likely to get sick.