Window Rock, Ariz. • The Navajo Nation is now under a public health state of emergency declared by tribal President Jonathan Nez due to the growing spread of the coronavirus outbreak.

Nev’s office said in a statement announcing the declaration Wednesday that there were no confirmed cases on the tribe’s sprawling reservation that includes parts of Arizona, New Mexico and Utah.

But Nez said in the statement issued Wednesday night that the declaration is a "proactive measure to help ensure the Navajo Nation's preparedness and the health and well-being of the Navajo people."

The statement said Nez also imposed travel restrictions for all executive-branch employees

The virus outbreak has been designated a pandemic by the World Health Organization.

For most people, the new coronavirus causes only mild or moderate symptoms, such as fever and cough. But for some, especially older adults and people with existing health problems, it can cause more severe illness, including pneumonia.

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The vast majority of people recover from the new virus. According to the WHO, people with mild illness recover in about two weeks, while those with more severe illness may take three to six weeks to recover.