This morning, we're releasing a major change in our COVID-19 model (➡️ http://covid19.healthdata.org ). We're now incorporating excess mortality to approximate the total COVID-19 death rate worldwide.
Our understanding of the magnitude of COVID-19 to date has been much worse than what we have been thinking. 🗓️ We are also extending our COVID-19 projections out to September 1, 2021 (they previously went out to August 1, 2021).
With this total COVID-19 mortality adjustment, these are the countries that we estimate currently have the highest total COVID-19 deaths .vs. reported COVID-19 deaths:
This map reflects what we estimate to be the total COVID-19 death rate through May 3, 2021:
What kind of statistical methods are we using to calculate total COVID-19 mortality? Dr. Murray explains:
Reported COVID-19 mortality is strongly related to how much testing a country has done. So total COVID-19 mortality includes predicted ratios, and we've used these kinds of statistical methods in our annual #GBDstudy.
Key takeaways on our new modeling approach outlined below. 📺 To watch the full video of Dr. Murray discussing total COVID-19 mortality, visit: https://bit.ly/IHME-Episodes 
You can follow @IHME_UW.
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