sequence analysis of measles virus strains collected during the pre- and early-vaccination era in denmark reveals a considerable diversity of ancient strains.a total of 199 serum samples from patients with measles collected in denmark, greenland and the faroe islands from 1964 to 1983 were analysed by pcr. measles virus (mv) rna could be detected in 38 (19%) of the samples and a total of 18 strains were subjected to partial sequence analysis of the hemagglutinin gene. the strains exhibited a considerable genomic diversity, which is at odds with the assumption that one genome type prevailed among globally circulating mv strains prior to the advent of ...200212064866
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