A new type of Ebola virus has been discovered. Though it seems to kill fewer of the people it infects, it could make finding a vaccine more tricky.
Of the 58 people in western Uganda known to have contracted the new type of Ebola since mid-November, fewer than a third have died, and reports suggest that some patients do not suffer from internal bleeding, a hallmark of Ebola fever. The mortality rate so far is significantly lower than the 50 to 90 per cent typical of the two types of Ebola virus already known.
Virologists had already discovered a type…
