The Whooping Cough Family | GenomeWeb

By sequencing some 343 strains of Bordetella pertussis collected in 19 different countries between 1920 and 2010, researchers led by Frits Mooi from the National Institute of Public Health and the Environment in The Netherlands constructed a phylogeny for the pathogen, as they report in mBio.

In this whooping cough family tree, the researchers noted a deep, large branch: One of those branches included 98 percent of the strains and arose sometime in the 16th century.

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