Luckily, the genetic testing proved that, in fact, this strand came north, because, had it come from the south, it would have had a much wider impact in terms of transmission.
خوشبختانه، تست ژنتیک اثبات کرد که که این رشته DNA (ویروس فلج) از شمال آمده بود. چون اگر از جنوب آمده بود، اثر بیشتری در سرایت می داشت.