WINDOW ROCK, Ariz. (AP) — Navajo Nation health officials on Wednesday reported 18 new confirmed cases of coronavirus with two additional deaths.

The Navajo Department of Health says there now have been 539 known deaths and 10,059 confirmed cases on the vast reservation since the pandemic began.

The latest numbers include 49 positive COVID-19 additional cases due to delayed reporting from New Mexico. The Navajo Nation covers parts of Arizona, New Mexico and Utah.

Tribal health officials say 100,809 people have been tested for the coronavirus and 7,190 have 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.