The state had 708,041 COVID-19 cases—an increase of 8,099 from the previous day, and 229 deaths, bringing the number of statewide virus-related deaths to 12,001 on Jan. 22, according to data from the Arizona Department of Health Services.
The number of diagnostic tests reported in Maricopa County as of Jan. 22 was 13,423 according to the state, with 31.94%—or 4,287 tests–coming back positive. Those tests include polymerase chain reaction, known as PCR, tests and antigen tests. The PCR test determines an active case of COVID-19, the other kind of testing data the state tracks is related to serology—or antibody—tests, which determines if a person has been infected in the past with the virus. Antigen tests "may not be as accurate or able to run as many patient samples per day, however, the quick results provide the ability to rapidly triage and make decisions," according to ADHS.
Of the county's 6,819 known deaths, 1,709 are tied to long-term care facilities.
The state and county also track hospitalization data. In Maricopa County, 7% of the county's total cases resulted in hospitalization as of Jan. 21. The county tracks intensive care unit, or ICU, data separately, and fewer than 1% of the county's total cases have resulted in admittance to the ICU. Statewide, as of Jan. 21, ADHS reported 7% of the state's cases have resulted in hospitalization—49,602 cases across the state.
According to data from the state, of the completed and reported Maricopa County COVID-19 diagnostic tests, 14.6% of them have yielded a positive result.
Statewide, there have been 3,308,691 diagnostic tests completed. Of the total PCR tests across the state, 15.1% have yielded a positive result.