American with Ebola upgraded from critical to serious
![fdde7bb5-](https://images.foxtv.com/static.fox5dc.com/www.fox5dc.com/content/uploads/2019/10/764/432/28623073_1_30555_ver1.0_1280_720.jpg?ve=1&tl=1)
An American health care worker with Ebola who is being treated at the National Institutes of Health has improved from critical to serious condition.
The worker contracted Ebola while volunteering in a Sierra Leone treatment unit and arrived at the hospital earlier in March.
The person is a clinician working with Partners in Health, a Boston-based nonprofit organization.
The group has been treating patients in Liberia and Sierra Leone since November.
The Associated Press contributed to this report.