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.

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.

Health officials at the Center for Disease Control have reportedly been ordered to stop working with the World Health Organization, following Trump's criticisms on the agency.

Staff at the U.S. Centers for Disease Control and Prevention (CDC) have been told to stop communication with the World Health Organization (WHO), in the wake of President Donald Trump's order withdrawing from the health agency.