NAIROBI — There are many “blind spots” in the Ebola outbreak in the Democratic Republic ​of Congo, a World Health Organization expert ‌said on Friday, suggesting the spread of the deadly disease may be much wider than official estimates. Congo said ​on Thursday the disease had spread to three ​new health zones. It reported 676 confirmed ⁠cases and 136 deaths in an outbreak that ​has also spread to neighboring Uganda. “There are still ​many blind spots in some areas that are high risk,” Olivier