An Ebola virus outbreak in the Democratic Republic of Congo and in Uganda is suspected to have caused more than 130 deaths and nearly 600 infections, according to the World Health Organization. The W.H.O. has declared the outbreak “a public health emergency of international concern” and expressed worry about its scale and spread. But Tedros Adhanom Ghebreyesus, the director general of the W.H.O., said on Wednesday that the outbreak was unlikely to become a global threat. The type of Ebola virus