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Ectromelia virus N1L is essential for virulence but not dissemination in a classical model of mousepox.
Virus Research 2017 January 16
Mousepox is caused by the orthopoxvirus ectromelia virus (ECTV), and is thought to be transmitted via skin abrasions. We studied the ECTV virulence factor N1 following subcutaneous infection of mousepox-susceptible BALB/c mice. In this model, ECTV lacking N1L gene was attenuated more than 1000-fold compared with wild-type virus and replication was profoundly reduced as early as four days after infection. However, in contrast to data from an intranasal model, N1 protein was not required for virus dissemination. Further, neither T cell nor cytokine responses were enhanced in the absence of N1. Together with the early timing of reduced virus titres, this suggests that in a cutaneous model, N1 exerts its function at the level of infected cells or in the inhibition of the very earliest effectors of innate immunity.
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