SAN DIEGO (CBS 8) - Saturday marked a major milestone in the Ebola crisis after the World Health Organization declared Liberia Ebola free.

Saturday also marked the 42nd day in which there have been no new Ebola cases reported in Liberia.

Jolene Mullins works for a San Diego based non-profit called Project Concern International and just recently returned from Liberia. For the past two years, she has called Liberia her home and she says that the lessons learned from this outbreak will help the world battle the next one.

Mullins moved to Liberia in April of 2013. While there, she helped to train health workers how to protect themselves from the virus and in turn, help to train others.

"People stopped touching each other, no longer hugged each other for nine months. No one shook hands for nine months. Can you imagine how difficult that was?" Mullins said. 

She says that even though Liberia has turned a corner, Ebola in countries like Guinea and Sierra Leone are reminders that we're not out of the woods yet.

"We're not truly Ebola free until they are," says Mullins. "Once you've had an outbreak of this size, there is no reason to believe you won't have another one. We have to be prepared."

Jolene says she will be returning to Liberia on Monday.