... contain multiple genotypes (B1 – 3, C1 – 2,D1 – 10, G1 – 3, H1 – 2) while clades A, E and F each con-tain a single genotype (A, E, F) [1,2]. The sequences of the vaccine strains indicate that the ... sequencessuggesting rapid spread of a single lineage [51]. Analysis of measles viruses circulating in Burkina Faso, before andafter a mass vaccination campaign, showed that the number of circulating lineages ... clusters, assisting classical epidemiological investiga-tions and the tracking of chains of transmission [7,64].Competing interests The author(s) declare that they have no competing inter-ests.Authors'...