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.A U.S. Centers for Disease

CDC official John Nkengasong, sent a memo to senior leaders at the agency ordering them to cut off all communications with the WHO and “await further guidance" in compliance with President Trump's exe

In line with Trump's executive order to end all collaboration with the WHO, the CDC has been instructed to end all communications and work with the international public health agency.

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