Efficacy evaluation of foot-and-mouth disease (FMD) vaccines has been conducted in target animals such
as cows and pigs. In particular, handling FMD virus requires a high level of biosafety management and
facilities to contain the virulent viruses. The lack of a laboratory animal model has resulted in inconvenience
when it comes to using target animals for vaccine evaluation, bringing about increased cost, time
and labor for the experiments. The FMD mouse model has been studied, but most FMD virus (FMDV)
strains are not known to cause disease in adult mice. In the present study, we created a series of challenge
viruses that are lethal to adult C57BL/6 mice. FMDV types O, A, and Asia1, which are related to frequent
FMD outbreaks, were adapted for mice and the pathogenesis of each virus was evaluated in the mouse
model. Challenge experiments after vaccination using in-house and commercial vaccines demonstrated
vaccine-mediated protection in a dose-dependent manner. In conclusion, we propose that FMD vaccine
evaluation should be carried out using mouse-adapted challenge viruses as a swift, effective efficacy test
of experimental or commercial vaccines.