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  1. In Australia the Dtap vaccine (acellular pertussis vaccine) was not phased in until 1999-2004 (over a 4 year period). Prior to this we were using the whole cell pertussis vaccine and fully vaccinated communities in Australia (with 85-90% vaccination rates in infants) were still having ourbreaks of whooping cough through the 1990’s. There were 9 deaths in 1997-98 as vaccination rates were increasing and only 1 death per year for the previous 20 years before that.
    Reference: Whooping Cough in Australia Research – https://vaccinationdecisions.net/wp-content/uploads/2011/09/Masters-Thesis-An-Analysis-of-the-Australian-Governments-Whooping-Cough-Policy-Policy-JWilyman.pdf

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