Staff at the US Centers for Disease Control and Prevention have been ordered to stop communicating with the World Health Organization, according to a new memo, dealing a significant blow to global health efforts.

U.S. public health officials have been told to stop working with the World Health Organization, effective immediately.

U.S. Centers for Disease Control and Prevention (CDC) staff have been ordered to cut communication with the World Health Organization

The White House has directed the Atlanta-based Centers for Disease Control and Prevention (CDC) to cease all collaboration with the World Health Organization.