NEW YORK (AP) — The Ebola outbreak in Congo passed a grim milestone this week — 10,000 confirmed cases — and spurred questions about whether health authorities are losing their ability to contain it.

Nearly half the infected people in this outbreak have died, and some experts say there are reasons to worry this could grow into the worst Ebola outbreak in history. Others don’t think it will reach that level. Researchers are currently working on updated projections.

Current circumstances suggest it’s unlikely to spark significant problems in most other countries, some researchers said. But about 30 confirmed cases have already popped up in other nations.…