By Marina Koren for The Atlantic.

More than 19 months since the first case of the world’s worst Ebola outbreak was reported in West Africa, Sierra Leone has been declared free of the disease.

The World Health Organization said Saturday that 42 days—the length of two incubation cycles of the deadly virus—had passed since the last person confirmed to have the disease cleared a second consecutive blood test.

“The Ebola outbreak has decimated families, the health system, the economy, and social structures,” said Dr. Anders Nordström, the WHO representative in Sierra Leone, in a statement. “All need to recover and heal.”