Arizona's COVID-19 cases are accelerating quickly as more testing becomes available, with at least 336 identified cases and six known deaths reported Tuesday.

The number of cases increased 43.59% since Monday.

Gov. Doug Ducey first announced the state had five total deaths known to be from COVID-19 on a KTAR (92.3 FM) radio show Tuesday morning.

Chris Minnick, an Arizona Department of Health Services spokesman, confirmed Tuesday night that a death in Coconino County was the sixth in the state.

Three known deaths have occurred in Maricopa County, according to county data, as well as one in Pima County and one in Coconino County. It is unclear in which county one of the deaths happened.

Coconino County reported its first known death related to COVID-19 on Tuesday. The man was in his 50s with underlying health conditions, the county said in a press release.

The county is working to identify and contact people who had been in close contact with the man, and those people will be asked to quarantine or isolate as necessary.

“Our thoughts are with the family during this difficult time,” county incident commander and deputy county manager Dr. Marie Peoples said in the press release. “We share in this family’s grief and are deeply committed to doing all we can to ensure the health and safety of our community. We urge everyone to take precautions to protect themselves and their family including washing their hands frequently, staying home when they are sick and contacting a healthcare provider for medical guidance.”

Additionally, the Gila River Indian Community announced two positive cases of COVID-19 from patients who visited a Gila River Health Care facility. It's not clear if the two cases are included in Tuesday's identified cases in the state's database.

Gila River Indian Community Gov. Stephen Roe Lewis made the announcement Monday in a video posted on Facebook. He said both patients went to a hospital showing symptoms of the new coronavirus. No details on which Gila River Health Care facility the patients went to were provided.

One positive case is a citizen of the Gila River Indian community and resident of the community's District 1 in Pinal County. The second is from a different tribe residing outside Gila River Indian community, but went to Gila River Health Care for treatment. No details were provided on which tribe the second patient belonged to.

On Monday, the state reported 234 identified cases of COVID-19, the disease caused by the new coronavirus, and Pima County reported its first death.

The number of cases is likely much higher than official numbers suggest. People have reported trouble getting tested, as health professionals confront confusion over who to test and a lack of supplies.

The state health department's publicly reported numbers only provide positive test results from private labs, not the total number of people tested, leaving the online data incomplete.

The entry of private labs into testing appears to be helping the state identify cases, as the majority of reported positive cases are coming from private labs. Of the 326 identified cases reported Tuesday morning, 285 were reported by private labs while 41 came from the state lab.

Before Tuesday, three deaths known to be from the disease had been announced in the state. They were a woman in her 50s with underlying health conditions in Pima County, a Maricopa County man in his 50s with underlying health conditions and a man in his 70s with underlying health conditions in Maricopa County.

A majority of Arizona's identified cases were in Maricopa County, with a total of 199 Monday, according to data on the state health department's website.

In Maricopa County, the public health department has provided additional data on the 199 cases, including:

The majority of them are male, with 113 cases or 57%.

The largest age group represented is those aged 18 to 39, with 75 cases or 38%.

People aged 40-59 make up 33% of cases, while those over age 60 make up 30%.

Thirty-five of the 199 are hospitalized, or 18%.

Thirteen of those hospitalized are in the intensive care unit, comprising 7% of the total cases.

The county has had three known deaths from COVID-19.

Pima County had identified 42 cases, Navajo County had 32 cases, Pinal County had 22 and Coconino County had 18, according to state data. Apache County had four cases and Yavapai County had three cases. Graham County had two, as did Yuma County. Cochise and Santa Cruz counties each had one.

Pinal County gave further details on its new cases on Tuesday: three females in their 20s, 40s and 70s, and three males in their 30s, 40s and 50s. The cases are not related to each other or to previous cases, the county said in a news release. All are in isolation at home and recovering. Pinal County now has 22 cases, only one of which, a female in her 80s, is hospitalized.

No cases had been identified in Mohave, La Paz, Greenlee and Gila counties as of Tuesday morning, the website showed.

Separately, Arizona State University said Tuesday that 15 of its students had now tested positive for COVID-19. Most of the students are still living in Arizona, ASU said.

Citing privacy laws, ASU said it won't disclose where the people who tested positive live, whether in the dorms or off campus.

At the University of Arizona, there have been three members of the university community who have tested positive for COVID-19, the university said. University officials did not specify whether those community members were students.

On Tuesday evening, the Navajo Nation announced the number of COVID-19 cases rose to 49, which is up 10 from their report Tuesday morning. This includes 43 in Arizona: There are 30 in Navajo County, seven in Apache County, six in Coconino County in Arizona, four in McKinley County and two in San Juan County in New Mexico.

These numbers do not appear to be reflected in state data yet.

The "stay at home" order issued by Navajo Nation President Jonathan Nez remains in effect. This requires residents on the Navajo Nation to stay home and eliminates non-essential travel.

“To protect ourselves, our families, and communities, we need to stay home to beat the virus. Every person must remain home unless you need food, medicine, or other essential items, but beyond that, we shouldn’t have anyone traveling or going out into the public," Nez said in a press release. "If you need essential items, send only one person and use every precaution available, such as taking sanitizing wipes or hand sanitizers into stores."

Residents of the Navajo Nation can also now sign up for emergency alerts issued by the Navajo Department of Emergency Management. An alert was issued on Monday urging all Navajo residents to stay home, the press release states. To sign up for the emergency alerts text "Navajo Nation" to 888777 or register online at www.nnalert.com.

Republic reporter Shondiin Silversmith contributed to this article.

Reach reporter Rachel Leingang by email at rachel.leingang@gannett.com or by phone at 602-444-8157, or find her on Twitter and Facebook.

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