When was the outbreak declared a Public Health Emergency? Why?

Public health emergency is potentially is the serious unusual and unexpected  immediate international action.

Explanation:

A public health emergency of international is formal declared by the (who) world health organization to determined to public health risk  to international disease require a international response.

Public health emergency sates have a legal duty to the respond to a international health emergency of the international experts.

Public health emergency is not declare the  international health emergency infections diseases, to the chemical radioactive material.

Health care system is to provide by good surveillance data collection and organisation and to delay the outbreak and widespread of its an international concern.q

World health organization is requires to account to human health and international made committee of experts, when they announced a regional emergency.

That a effective in international health emergency system in dealing emergency was robust.