Molecular mapping of Zika spread

Evolutionary trees constructed using both newly sequenced and previously available Zika virus genomes reveal how the recent outbreak arose in Brazil and spread across the Americas. See Letters p.401 , p.406 & p.411 Three papers in this issue present a wealth of new Zika virus (ZIKV) genome sequences and further insights into the genetic epidemiology of ZIKV. Nathan Grubaugh et al. provide 39 new ZIKV genome sequences from infected patients and...