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In 2017, novel human metapneumovirus (HMPV) A2b subgroup strains with a 111-nucleotide duplication in the G gene was detected by the present team. These strains were related to previously identified HMPV A2b strains with a 180-nucleotide duplication; however, they appeared to be different strains, produced by an independent duplication event. The recent evolution of HMPV suggests that careful monitoring of this virus is required.
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Saikusa et al. (2017) studied this question.
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