Window Rock, Ariz. • The Navajo Nation is reporting 56 additional COVID-19 cases and no additional deaths related to the virus on the tribe’s sprawling reservation, officials said Monday.

There have been more than 8,200 cases and 401 deaths reported on the reservation since the pandemic began.

Tribal officials say nearly 65,000 people on the reservation have been tested for the coronavirus and more than 5,800 people had COVID-19 but recovered.

The number of infections is thought to be far higher because many people have not been tested, and studies suggest people can be infected with the virus without feeling sick.

The reservation includes parts of Arizona, New Mexico and Utah.

A weekend lockdown that began Friday night ended at 5 a.m. Monday. All businesses on the Navajo Nation are also required to close during the lockdown.

For most people, the new coronavirus causes mild or moderate symptoms, such as fever and cough that clear up in two to three weeks. For some, especially older adults and people with existing health problems, it can cause more severe illness, including pneumonia and death. The vast majority of people recover.