Circulation of measles virus genotypes globally reported through
virologic surveillance, 1970–2019.
Figure shows year of first and last detection of measles wild-type virus
genotypes. The first and last years of documented circulation reported to the
MeaNS database (or GenBank before 2005) for all 24 measles virus genotypes are
shown. First year detection determined from earliest reported reference strain
and does not necessarily indicate first year of circulation. The four currently
circulating genotypes (detected in 2019) are indicated in red (B3, D4, D8, H1).
Measles vaccines were derived from genotype A which is not shown.