All Indicators Confirm COVID Third Wave Receding in Arizona

We’ve been following Arizona’s experience with the coronavirus experience since the state makes its high quality data publicly available. That data makes it relatively easy to identify turning points in the rate of incidence for exposure to the SARS-CoV-2 coronavirus within the state.

The state’s data as of 1 October 2021 confirms the rate of incidence of new COVID infections in its third wave peaked during the week of 15 August 2021 through 21 August 2021. All indicators, including cases, hospitalizations, and deaths all point to that timing as the data is now complete enough to make that confirmation:

The timing is notable in that neither the state nor the federal government adopted any new interventions, such as mask-wearing policies during that period, making it different from earlier periods where changes in trend coincided with such interventions.

Since peaking, the number of new cases has fallen slowly, though new hospital admissions have fallen more steeply. The data for deaths lags behind these two other indicators, so it will be interesting to see which trajectory of these two other data series they more closely follow in the weeks ahead.

Previously on Political Calculations

Here is our previous coverage of Arizona’s experience with the coronavirus pandemic, presented in reverse chronological order.

• Arizona’s Third COVID Wave Peaks and Begins to Recede
• Arizona COVID Cases Rising in Third Wave
• Arizona COVID Cases on Slow Uptrend in Summer 2021
• Increase in Arizona COVID Cases from Border Migration Crisis Stabilizing
• COVID-19 and the 2021 Border Migration Crisis in Arizona
• Improving COVID Trends Bottom and Flatline in Arizona
• Surge of Migrants, Lifting of Business Capacity Limits Change Arizona COVID Trends
• COVID-19 in Retreat in Arizona With Vaccines Gaining Traction
• The Ebb and Flow of COVID-19 in Arizona’s ICUs
• Arizona’s Plunging COVID-19 Caseloads and the Vaccines
• Arizona Enters Downward Trend for COVID-19 After Second Peak
• Arizona Passes Second COVID-19 Peak
• A Tale of Two States and the Coronavirus
• COVID-19 Questions, Answers, and Lessons Learned from Arizona
• The Deadly Intersection of Anti-Police Protests and COVID-19
• 2020 Campaign Events Drive Surge in Arizona COVID Cases
• Arizona Arrives at Critical Junction for Coronavirus Cases
• Arizona To Soon Reach A Critical Junction For COVID-19
• Getting More Than Care from Arizona’s COVID ICU Beds
• Arizona’s Decentralized Approach to Beating COVID
• Going Back to School with COVID-19
• Arizona Turns Second Corner Toward Crushing Coronavirus
• Arizona’s Coronavirus Crest in Rear View Mirror
• The Coronavirus Turns a Corner in Arizona
• A Delayed First Wave Crests in the U.S. and a Second COVID-19 Wave Arrives
• The Coronavirus in Arizona
• A Closer Look at COVID-19 Deaths in Arizona
• The New Epicenter of COVID-19 in the U.S.
• How Long Does a Serious COVID Infection Typically Last?
• How Deadly is the COVID-19 Coronavirus?
• Governor Cuomo and the Coronavirus Models
• How Do False Test Outcomes Affect Estimates of the True Incidence of Coronavirus Infections?
• How Fast Could China’s Coronavirus Spread?

References

We’ve continued following Arizona’s experience during the coronavirus pandemic because the state’s Department of Health Services makes detailed, high quality time series data available, which makes it easy to apply the back calculation method to identify the timing and events that caused changes in the state’s COVID-19 trends. This section links that that resource and many of the others we’ve found useful throughout the coronavirus pandemic.

Arizona Department of Health Services. COVID-19 Data Dashboard: Vaccine Administration. [Online Database]. Accessed 1 October 2021.

Stephen A. Lauer, Kyra H. Grantz, Qifang Bi, Forrest K. Jones, Qulu Zheng, Hannah R. Meredith, Andrew S. Azman, Nicholas G. Reich, Justin Lessler. The Incubation Period of Coronavirus Disease 2019 (COVID-19) From Publicly Reported Confirmed Cases: Estimation and Application. Annals of Internal Medicine, 5 May 2020. https://doi.org/10.7326/M20-0504.

U.S. Centers for Disease Control and Prevention. COVID-19 Pandemic Planning Scenarios. [PDF Document]. 10 September 2020.

More or Less: Behind the Stats. Ethnic minority deaths, climate change and lockdown. Interview with Kit Yates discussing back calculation. BBC Radio 4. [Podcast: 8:18 to 14:07]. 29 April 2020.