The Arizona Department of Health Services is reporting over 194,000 cases of COVID-19 as of Monday morning.

In Arizona, there are 194,005 cases and 4,506 deaths of the novel coronavirus, up 468 and zero from Sunday morning, respectively.

The number of cases could be higher because many people have not been tested, and some can be infected without feeling sick.

The Maricopa County Department of Public Health is reporting 129,390 cases and 2,546 deaths of COVID-19 in the state’s most populous county.

Maricopa County shows a case rate of 2,889 cases per 100,000 residents, using 2019 population estimates. The state rate is 2,665. Santa Cruz County has the highest at 5,817 cases per 100,000 residents.

As of Monday morning, Arizona had the lowest R-naught in the nation at 0.80. Massachusetts is second with 0.83. This is the average number of people who become infected by an infectious person. Less than 1.0 is ideal, officials say.

According to Johns Hopkins University data analyzed by The Associated Press, seven-day rolling averages of daily new cases in Arizona and of daily deaths in the state have sharply declined over the past two weeks.

COVID-19-related hospitalizations in Arizona peaked about a month ago following Gov. Doug Ducey’s lifting of stay-home orders in May.

With Arizona then becoming a national hot spot, Mr. Ducey in late June re-imposed some restrictions and allowed local governments to impose masking requirements.

The coronavirus causes mild or moderate symptoms such as fever and cough for most people. The vast majority of people who are diagnosed with COVID-19 recover.

But for some — especially older adults and people with existing health problems — it can cause more severe illness including pneumonia, and death.