Whooping cough vaccine does not work well

Recent research confirms something we already knew: that the whooping cough vaccine is relatively ineffective. There was an outbreak of whooping cough in a Florida kindergarden in 2013. Of the 33 children, aged betweem one and six years, who contracted whooping cough, 28 had received at least three doses, and 23 at least four doses, of vaccine. The vaccine effectiveness was calculated as 45 per cent. What is of particular concern is that the average length of time between the last dose of vaccine received by a child and the onset of symptoms was less than two years; seven children had been vaccinated during the previous year.