Researchers had assumed that the disease jumped from animals to humans, but a recent rise in cases pointed to person-to-person transmission as well.
Baarayaasha waxa ay u maleeynayaan in cudurka uu ka bilowday xayawaanku una gudbay aadanaha, laakiin waxaa kaloo soo kordhayay kiisas la xariira isu gudbinta qof-ka iyo qofka kale.