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Whole-cell vaccine was more effective than acellular vaccine during CA pertussis outbreak
Date:5/19/2013

OAKLAND, Calif., May 20, 2013 Whole-cell pertussis vaccines were more effective at protecting against pertussis than acellular pertussis vaccines during a large recent outbreak, according to a new Kaiser Permanente study published in Pediatrics.

Whole-cell pertussis vaccines, also called DTwP, were available from the 1940s to 1990s, but were associated with safety concerns that ultimately led to the development of acellular pertussis vaccines, which are also called DTaP. By the late 1990s, the United States had switched from whole-cell to acellular vaccines for all five recommended infant and childhood doses.

The study, which followed the 2010-2011 pertussis outbreak in California, examined 10- to 17-year-olds who received the recommended four pertussis-containing vaccines. The researchers evaluated the risk of pertussis during the outbreak according to the number of whole-cell and/or acellular pertussis vaccines these participants had received as infants and toddlers.

Despite high levels of vaccine coverage, pertussis epidemics have arisen every three to five years since the 1980s, with progressively higher incidence rates over time. "Studies have suggested that protection following the acellular pertussis vaccine is less enduring than following the whole-cell pertussis vaccine," said lead author Nicola Klein, MD, PhD, co-director of the Kaiser Permanente Vaccine Study Center and a pediatrician. "Although reasons for the recurrent pertussis outbreaks are complex, waning protection following five doses of acellular pertussis vaccine plays a central role, at least in recent epidemics."

The study included 138 individuals with confirmed pertussis, 899 individuals who had a lab test indicating they did not have pertussis, and 54,339 individuals who were similar to those with confirmed pertussis on sex, race/ethnicity, medical clinic, and membership status.

Increased number of acellular doses from zero to four wa
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Contact: Vincent Staupe
vstaupe@golinharris.com
415-318-4386
Kaiser Permanente
Source:Eurekalert

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