Por lo tanto, a menos que se desarrolle una vacuna inactivada marcada — es decir, una vacuna cuyo organismo patógeno tenga su origen en una vacuna —, será imposible distinguir entre un animal vacunado y un animal infectado por el virus.
Therefore, unless a marked inactivated vaccine – that is, a vaccine of which the pathogenic organism is of vaccine origin – is developed, it will be impossible to distinguish between a vaccinated animal and an animal infected by the virus.