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Vaccine effectivity <br />Pertussis vaccines are effective, but not <br />perfect. <br />Typically offer good levels of protection <br />within the first 2 years after getting the <br />vaccine, but then protection decreases <br />over time. <br />Public health experts call this ‘waning <br />immunity.’ <br />Similarly, natural infection may also only <br />protect you for a few years. <br />