Abstract
QS-BHK-P7, street rabies virus, after passages in the BHK cell line, had an in vitro phenotype that distinguished it from its parental virus. Both viruses caused lethal infection in mice by central nervous system inoculation; however, only QS-BHK-P7 killed mice by the intramuscular route. We found four mutations, S23R and H424P in ectodomain of the glycoprotein (G), I1711 V in the polymerase genes, and another at the non-coding region between the phosphoprotein and matrix protein genes of QS-BHK-P7. None of the mutations in the G gene occurred in previously reported pathogenic determinants. The roles of mutations in particular non-coding regions remain to be elucidated.

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Acknowledgments
This work was part of the encephalitis project, supported by Thailand Research Fund through the Royal Golden Jubilee Ph.D. Program (Grant No.PHD/0020/2550) (PV and TH), the Naval Health Research Center BAA-10-93 under Cooperative Agreement Number W911NF-11-2-0041, the Thailand Research Fund (DBG5180026) and the Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Education Commission (HR1160A-55). The views and conclusions contained in this document are those of the authors.
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Virojanapirom, P., Khawplod, P., Sawangvaree, A. et al. Molecular analysis of the mutational effects of Thai street rabies virus with increased virulence in mice after passages in the BHK cell line. Arch Virol 157, 2201–2205 (2012). https://doi.org/10.1007/s00705-012-1402-z
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DOI: https://doi.org/10.1007/s00705-012-1402-z