The CDC, can't blame the non vaxers for the outbreaks, the vaccine, from the CDC Press briefing transcript on the pertussis epidemic in WA:
Dr Anne Schuchat, CDC director for the National Center for Immunization and Respiratory Diseases:
"We know there are places around the country where there are large numbers of people who aren't vaccinated. However, we don't think those exemptors are driving this current wave. We think it is a bad thing that people aren't getting vaccinated or exempting, but we cannot blame this wave on that phenomenon. Next question"
Here is the full transcript:
I highly recommending reading this chapter on Whooping Cough from Hilary Butler's book, "From One Prick to Another, because the reason why adults and children are spreading pertussis is because they were vaccinated in the first place. It can be accessed as a download from this article.