The whooping cough — or pertussis — vaccine used today is different from the one used as recently as the late 1990s. The older vaccine used whole pertussis cells, but it was shelved in favor of a vaccine with purified cells. The newer vaccine has fewer side effects, doctors have noted that its efficacy wanes more quickly. This new study reinforces prior reports.
Lisa Aliferis is the founding editor of KQED's State of Health blog. Since 2011, she's been writing stories and editing them for the site. Before taking up blogging, she toiled for many years producing health stories for television, including Dateline NBC and San Francisco's CBS affiliate, KPIX-TV. She also wrote up a handy guide to the Affordable Care Act, especially for Californians. You can follow her on Twitter: @laliferis