Analysis of 343 strains of the Bordetella pertussis bacteria collected from around the world over the last 100 years illustrates how vaccination has shaped the bacteria’s evolution, according to researchers at Wellcome Trust Sanger Institute and the National Institute of Public Health and the Environment in the Netherlands.
By analyzing the family of bacteria that causes whooping cough, researchers with the study say their findings could highlight more effective vaccine strategies and reveal surprising insight regarding the bacteria’s origin and evolution. Investigators also believe the research may help alter public health strategies to control the respiratory disease, which kills 195,000 children worldwide each year.
Global phylogeny of B. pertussis. A, deep divergence between lineages I and II; B, more detailed phylogeny. Dates of whole cell vaccine (WCV) and acellular vaccine (ACV) strategies are shown as colours behind the tree. Isolates’ origins are shown by bars coloured according to the world map. Green circles indicate positions of genome reference isolates, black circles represent American vaccine strains and red circles indicate major changes in proteins used for acellular vaccines.
Since its introduction across the globe between 1940 and 1960, vaccination has dramatically reduced rates of infection and loss of life from whooping cough. However, current strategies have not completely eradicated strains of the bacteria, instead leading to an increase in diversity.
“The scale of this study and the detailed family history of B. pertussis we are able to draw from it illustrate the journey this bacterium has taken since its emergence,” said Simon Harris of the Wellcome Trust Sanger Institute. “By seeing how an organism escapes vaccination we can build better strategies to control and eradicate it.”
While researchers suspect that the diversity may be the result of lineages of the bacteria persisting in unvaccinated populations, resurgence of B. pertussis has also been observed between 2010 and 2012 in highly vaccinated populations such as Australia, the Netherlands, the UK and the United States. One reason could be the widespread switch to the use of acellular vaccines, which, though better tolerated than the original whole-cell vaccines, tend to produce more rapidly-waning immunity.
“To stem the rise of whooping cough without returning to whole-cell vaccines, which can be reactogenic, we need to employ strategic vaccination,” said Marieke Bart of the National Institute of Public Health and the Environment. “This could include vaccinating mothers in pregnancy so babies are born with some level of protection and cocooning a newborn by vaccinating adults around it. In the long run, however, we need better pertussis vaccines.”
As well as suggesting strategies for control in the future, the study revealed new findings about B. pertussis’ past. Genetic analysis of the strains shows that whooping cough emerged and spread rapidly in humans in the late Middle Ages, around 500 years ago, not in the Neolithic period more than 10,000 years ago, as previously thought.
This finding resolves a puzzle that had troubled scientists for some time: despite characteristic symptoms and a high rate of mortality in unvaccinated children, records of whooping cough are entirely absent from ancient European literature. This new analysis, which places the emergence and rapid global spread of the infection in the human population within the last 500 years, is consistent with historical records that first identify the disease in Paris in 1578. The only earlier reference to a disease with similar symptoms has been found in a Korean medical textbook from the 15th Century.
“Over the past five years or so it has become clear that we have got our dating in bacteriology wrong,” said professor Julian Parkhill, a senior group leader at the Sanger Institute and a senior author of the study. “The mutation rate we were working with is probably two orders of magnitude out, so we thought the last common ancestor of these modern B. pertussis strains was tens of thousands of years old when, in fact, it is much younger than that.”
