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Mumps Hoshino and Torii vaccine strains were distinguished from circulating wild strains


Aseptic meningitis and acute parotitis have been observed after mumps vaccination. Mumps outbreaks have been reported in Japan because of low vaccine coverage, and molecular differentiation is required to determine whether these cases are vaccine associated. RT-nested PCR was performed in the small hydrophobic gene region, and viruses were differentiated by restriction fragment length polymorphism assay. A total of 584 nucleotides were amplified. The PCR product of the Hoshino strain was cut into two fragments (313 and 271 nucleotides) by MfeI; that of the Torii strain was digested with EcoT22I, resulting in 332- and 252-nucleotide fragments. Both strains were genotype B and had an XbaI site, resulting in two fragments: 299 and 285 nucleotides. Current circulating wild types were cut only by XbaI or MfeI. However, the MfeI site of the wild types was different from that of the Hoshino strain, resulting in 451- and 133-nucleotide fragments. Using three restriction enzymes, two mumps vaccine strains were distinguished from wild types, and this separation was applied to the identification of vaccine-related adverse events.

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Conflict of interest

The author has a conflict of interest. T.N. has received a research fund for the development of a new concept of live recombinant vaccines (20 million yen a year) from Daiichi-Sankyo Pharmaceutical.

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Correspondence to Tetsuo Nakayama.

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Sawada, A., Yamaji, Y. & Nakayama, T. Mumps Hoshino and Torii vaccine strains were distinguished from circulating wild strains. J Infect Chemother 19, 480–485 (2013).

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  • Mumps Hoshino strain
  • Mumps Torii strain
  • Molecular differentiation
  • Wild circulating genotypes