Two steps forward, one step back.

That’s the reality Friday in the fight against Ebola, with the World Health Organization announcing first that the deadly Ebola disease has reemerged in Liberia.

All this comes days after the same international health body declared that the Ebola outbreak in West Africa was no longer a public health emergency of international concern.

This is still true, even given the new Liberia case. But that doesn’t mean Ebola is gone entirely, nor that it won’t rear its ugly head again.

“Flare-ups, at decreasing frequency, are expected,” the WHO noted in a tweet Friday.

WHO’s announcement that a 30-year-old woman who died the previous afternoon in a Monrovia hospital had Ebola.

It wasn’t clear how she got the disease or if others she knew are infected. Just in case, Liberia’s Health Ministry and partner agencies are trying to track down any people who’d been in close contact with her.

Along with Guinea and Sierra Leone, Liberia was the epicenter of the 2014 Ebola outbreak. It had more than 10,000 documented cases as well as nearly 5,000 related deaths, more than any other country, according to WHO statistics.

Liberia was declared free of Ebola in May 2015, only to have the deadly disease rear its head again in subsequent months.

In September, the WHO again made the same declaration after 42 days had passed since tests showed the last infected person no longer had the disease.

•Extracted from a CNN report. Photo shows an Ebola patient receiving medical attention.