Mike Hoerger, PhD MSCR MBA Profile picture
Mar 11 25 tweets 8 min read Read on X
1) 5-yr Anniversary of the WHO Pandemic Declaration

🔥10 waves
🔥Covid mortality rivals lung cancer
🔥8 infections/person by 2030
🔥Long Covid as catastrophic
🔥Death trajectories becoming complex
🔥"During Covid" as anti-science rhetoric
🔥Serious ppl take Covid seriously
🧵
2) Wastewater-derived estimates of case rates show international consensus 20-26% of populations got Covid during the peak 2 months of the 2023-24 winter wave in the U.S., Canada, and the U.K.
3) The ratio of reported cases versus true cases has remained consistent, demonstrating the validity of wastewater-derived estimates. True cases are 15-30x reported cases, a consistent ratio. There are no examples demonstrating low case rates.
4) Misinformation is based on cognitive biases that steer people toward easy-but-bad data or lead them to overestimate their skills.

Disinformation can be blatant or grounded in specious pseudo-scientific arguments. Financial COIs are often the cause. Misinformation: Wastewater can’t predict cases  You can’t do that  “Streetlight effect,” “drunkard’s search,” or “McNamara fallacy”  “Dunning-Kruger fallacy”  Usually people w/expertise in adjacent or unrelated fields, or with clinical non-scientist backgrounds   Disinformation: Audacious lies: herd immunity, masks, tests, vaccines, air cleaning, surveillance Specious arguments: Whataboutism, amplifying trivial limitations, misrepresenting the CDC  Often serious Social/ Online Subscription & Ad Dollar Conflicts of Interest (SO SAD COIs)
5) Contrary to misinformation and disinformation, wastewater-derived estimates have a long history of publication on top scientific journals Example articles
6) The NYTimes shows that Covid continues to cause excess deaths, meaning it is killing hundreds of thousands of Americans in 2025.

Their estimates are overly simplistic but make the correct argument. See next few. NYT graph of excess deaths. Simple
7) More complex analyses of Covid excess deaths remain much too simplistic and often underestimate current Covid deaths. They do not account for "mortality displacement" -- the idea that so many have already died, we should be seeing fewer deaths by now. We're not. Our World in Data perpetuates bad Covid analyses that minimize Covid
8) Actuaries measure excess death correctly (or still slightly underestimate). They find Covid deaths are on par with lung cancer in 2025. Current excess death estimates using the best formulas show that under the "pessimistic" scenarios (similar to reality, if not lightly optimistic) Covid deaths are slightly higher than for lung cancer
9) The sources of Covid excess deaths are increasingly understood and paint a more pessimistic long-term trajectory, as demonstrated by (multi-systemic) non-respiratory deaths. Multi-systemic deaths on the rise, consistent with or surpassing more pessimistic scenarios.
10) The past and ongoing consequences of Covid will be marked by health disparities. Race, ethnicity, socioeconomic status, immigration status, LGBTQ. JAMA NO article on c19 disparities.
11) We are headed from nearly 4 Covid infections on average to 8 cumulative infections over the next 5 years if current trends hold. The Long Covid burden will be substantial.

Mitigating risk using multi-layered mitigation, like during the early pandemic, helps greatly. Line graph summarized in post
12) Nearly 5 million American adults have become disabled during the pandemic, with an ongoing linear trend because cumulative infections remain an ongoing burden.

We're doing almost nothing as a society to reduce infections. NYT graph
13) Children continue to become sick more frequently and more severely, with an increasing proportion missing multiple weeks of school.

So-called "lockdowns" don't case this. An annual Covid infection is the likely culprit. NYT graph
14) Younger adults are becoming disabled by Covid, though often still working. Women are particularly burdened. >1 million female workers <65 have become disabled during the pandemic
15) Though at a slower clip, male workers <65 years old are also becoming disabled by Covid.

>1 million female workers <65 have become disabled during the pandemic >0.5 million male workers <65 have become disabled during the pandemic
16) Older adults are dropping out of the workforce. 2.0-2.7 million so far, so-called "excess retirements" graph summarized in post
17) Covid deaths are less and less about acute deaths and more and more about complex non-acute death trajectories. Graphs of 4 prototypical death trajectories.
18) An example of a Covid cumulative reinfection death trajectory. Complex death trajectory, stairstep decline with c19 infections, with superimposed organ damage.
19) I have no idea what people mean by "during Covid" - a useless and anti-science concept. "During Covid" as the early pandemic
20) #DuringThePandemic is today. 10 covid waves, each labeled during the pandemic
21) #DuringCovid is today. 10 covid waves, each labeled as during covid
22) "During Covid" is anti-science offensive nonsense.

We don't say during car accidents, during lung cancer, or during diabetes to describe the onset or any time point of these public health problems. graphs of covid, car accidents, lung cancer, and diabetes, with "during" labels for the onsets
23) Many people are "high risk," simply based on known evidence, albeit imperfect. Many more are high risk based on unknown or undiagnosed factors. Most should assume a high risk family member or that high risk themselves. Estimated >50 million Americans with known high risk
24) NIH has required universal masking in 48 clinical centers for >4 months because they lead on healthcare. info from nih website
25) Over 75% of PMC Covid Dashboard viewers note using 4 layers of mitigation (masks, vax, tests, air quality) in the past 6 months. 95% use at least 3 out of 4 layers. described in post

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More from @michael_hoerger

Jul 29
PMC COVID Dashboard, July 28, 2025 (U.S.)
🧵1/12

PMC estimates 400,000 new daily infections. 1 in 118 people actively infectious.

Weekly stats:
🔹2.8 million infections (>40x reported cases)
🔹>140,000 resulting #LongCOVID cases
🔹>1,000 resulting excess deaths Heat map Very High: Louisiana, Guam High: Hawai'i, Florida
PMC COVID Dashboard, July 28, 2025 (U.S.)
🧵2/12

Please excuse any typos and delays. Any time Mimal's boot turns deep red, we're doing local outreach in addition to dashboard work, etc.

If you don't know Mimal yet, you won't be able to unsee them.
es.wikipedia.org/wiki/MIMALDeep red boot = Louisiana
Minnesota (M), Iowa (I), Missouri (M), Arkansas (A), Louisiana (L) = Mimal  Louisiana is the boot.   Sometimes depicted with Kentucky fried chicken on a Tennessee pan.
PMC COVID Dashboard, July 28, 2025 (U.S.)
🧵3/12

It's HOT COVID SUMMER in the Deep South. No geographic/political prejudices, see next.

Covid is burning through Guam, Louisiana, Florida, and Texas (underestimate due to sites down). Louisiana: 1 in 32, Very High (CDC)
Texas: 1 in 98, Moderate (underestimate, CDC)
Guam: 1 in 25, Very High (CDC)
Florida: 1 in 59, High (CDC)
Read 12 tweets
Jul 25
U.S. CDC numbers just released. Good news (for those not in Louisiana). "Only" a 5% national increase.

2025 has closely tracked with summer 2023 transmission. A 12-13% increase would have been expected based on those numbers. That said... Up: Midwest, Northeast Down: West, South
real-time data have been prone to retroactive corrections. This is frustrating, of course, because it leaves people making decisions based on data that are only of good quality when 2 weeks old.

If we saw a 12% increase this week, I'd say look at 2023 for a glimpse...
at the future. Instead, I would consider these plausible scenarios:
🔹Wave still similar to 2023
🔹Later wave with schools more implicated
🔹Something temporarily much better

Of course, temporarily better often means...
Read 6 tweets
Jul 21
1. PMC COVlD Dashboard, July 21, 2025 (U.S.)

COVlD is surging in 7 states, according to the CDC.
🔹Hawai'i (Very High)
🔹California (High)
🔹Nevada (High)
🔹Texas (High)
🔹Louisiana (High)
🔹Florida (High)
🔹South Carolina (High) Heat map, summarized in post
2. PMC COVlD Dashboard, July 21, 2025 (U.S.)

Western surge:
🔹California: 1 in 63 actively infectious, much higher in LA & Bay areas
🔹Hawai'i: 1 in 35 actively infectious
🔹Nevada: 1 in 63 actively infectious

These are wastewater derived estimates, not from individual tests CA map with stat summarized in post
NV  map with stat summarized in post
HI  map with stat summarized in post
3. PMC COVlD Dashboard, July 21, 2025 (U.S.)

Southern surge:

🔹Texas: 1 in 56
🔹Louisiana (New Orleans): 1 in 65
🔹Florida: 1 in 66
🔹South Carolina: 1 in 71

Again, wastewater estimates (wise indicator), not individual testing (low-quality data). SC map and stat noted in post
LA map and stat noted in post
FL map and stat noted in post
TX map and stat noted in post
Read 12 tweets
Jul 15
1) PMC COVlD Dashboard, July 14, 2025 (U.S.) 🧵

We estimate 1 in 148 Americans are actively infectious. This equates to 2.3 million infections/week, expected to result in >100,000 new #LongCOVID conditions & >800 deaths.

A room of 100 people is a coin toss of an exposure. Figure shows each wave of the pandemic.   Tables: Current Levels for Jul 14, 2025	 % of the Population Infectious	 0.7% (1 in 148)	 New Daily Infections	 324000	 New Weekly Infections	 2268000	 Resulting Weekly Long COVID Cases	 113,000 to 454,000	 Resulting Weekly Excess Deaths	 800 to 1,300	 	 Monthly Forecast	 Average % of the Population Infectious	 1.3% (1 in 80)	 Average New Daily Infections	 598766.6667	 New Infections During the Next Month	 17963000	 Resulting Monthly Long COVID Cases	 898,000 to 3,593,000	 Resulting Monthly Excess Deaths	 6,400 to 10,700	 	 Running Totals	 Infection...
2) PMC COVlD Dashboard, July 14, 2025 (U.S.) 🧵

Transmission (red) is closely tracking the path of 2 years ago (yellow). However, the incoming data are spotty. >20% of CDC states have limited/no data, & Biobot hasn't reported in weeks.

Could be MUCH worse or slightly better. Graph of year over year transmission. The current year (red) is tracking the path of two years ago (yellow) extremely closely. Two years ago, the peak was around September 1, at about 1 million daily estimated infections, and significantly higher than the Delta wave (blue).
3) PMC COVlD Dashboard, July 14, 2025 (U.S.) 🧵

Our model formalizes the mathematical assumptions in those predictions. If transmission follows what we know in terms of how waves grow or slow generally and historical patterns, this is what we'd expect.

The spottiness of the current real-time data reduce precision substantially. Retroactive corrections can make the forecast jump around from better to worse from one week to the next. Expect the worst. Hope for the best.Graph shows national transmission expected to increase the next several weeks.
Read 11 tweets
Jul 2
🌍Want to track COVID transmission accurately worldwide?

This PMC thread walks you through leading dashboards with information more up to date than WHO & EU directories.

🧵 1/ World map, countries with high-quality up-to-date surveillance systems shown in blue.
The Pandemic Mitigation Collaborative (PMC) Dashboard provides weekly COVID updates for the U.S., using wastewater surveillance derived case estimation models and analytic forecasting.

We have added a list of international dashboards:
🧵 2/
pmc19.com/data/index.php…Australia: NSW Health Australia Department of Health, Western Australia Austria: Federal Government of Austria City of Vienna - Regional Coron-A Consortium Austria Czech Republic: State Health Institute Czech Republic Belgium: Belgian Institute for Health Canada: Government of Canada Andrew Young's Canada Visualization C19 Resources Canada * World Health Network (WHN) Canada **
Denmark: Statens Serum Institut Denmark Europe (multi-national): EU Wastewater Observatory Finland: National Institute for Health and Welfare Finland WHN Finland ** France: French Republic Data Airborne Risk Reduction Association (ARRA) France Zan Armstrong's France Visualization COVID Weather App France (Android, IOS, or Web) Thomas Delattre's France Visualization Germany: Infection Radar Germany Bay-VOC Bavaria Region Berlin Waterworks WHN Germany **
Hong Kong: Centre for Health Protection, Hong Kong Hungary: National Center for Public Health and Pharmacy of Hungary India: Pune Knowledge Cluster of India Gujarat Biotechnology Research Centre of India Ireland: Health Protection Surveillance Centre Ireland Japan: Japan Institute for Health Security Latvia: Institute of Food Safety, Animal Health and Environment Latvia Lithuania: National Public Health Centre of Luthuania Luxembourg: Microbs Luxembourg Netherlands: National Institute for Public Health and the Environment Netherlands WHN Netherlands ** New Zealand: New Zealand Institute for...
Slovenia: National Institute of Public Health Slovenia Spain: Government of Catalonia - Regional South Africa: National Institute for Communicable Diseases of South Africa South Korea: Korea Disease Control and Prevention Agency Sweden: Pathogens Sweden Switzerland: Swiss Confederation Federal Office of Public Health ETH Zurich Switzerland WISE Dashboard U.K.: Public Health Scotland Buckinghamshire Disability Service (BuDS) U.K.  *See the numbers 1-21 along the lower left. Click on 3-6 for national and regional data. ** Click on the dropdown menu. May need to try a different web browser.
Our international directory includes official government dashboards & those developed by citizen scientists.

We exclude countries that have stopped reporting in the past 2-12 months even if on EU or WHO lists. We also exclude low-quality data from opt-in testing programs.
🧵 3/
Read 43 tweets
Jun 24
PMC COVlD Dashboard, Jun 23, 2025 (U.S.)

🔥Biggest uptick since Jan
🔥1 in 167 actively infectious
🔥>2 million weekly infections
🔥700-1,200 resulting excess deaths from weekly infections

Track transmission closer to home w/our new state & international resources 👇

🧵1/6
PMC COVlD Dashboard, Jun 23, 2025 (U.S.)

🔹With >90% probability, we have entered the 11th COVlD wave.
🔹In a room of 50 people, there is already a 1 in 4 chance of an exposure.
🔹We expect nearly 15 million infections in the next month, and rising.

🧵2/6Current Levels for Jun 23, 2025	 % of the Population Infectious	 0.6% (1 in 167)	 New Daily Infections	 287000	 New Weekly Infections	 2009000	 Resulting Weekly Long COVID Cases	 100,000 to 402,000	 Resulting Weekly Excess Deaths	 700 to 1,200	 	 Monthly Forecast	 Average % of the Population Infectious	 1.0% (1 in 97)	 Average New Daily Infections	 493300	 New Infections During the Next Month	 14799000	 Resulting Monthly Long COVID Cases	 740,000 to 2,960,000	 Resulting Monthly Excess Deaths	 5,300 to 8,800	 	 Running Totals	 Infections Nationwide in 2025	 74869000	 Average Number of Infect...
PMC COVlD Dashboard, Jun 23, 2025 (U.S.)

We continue to expect transmission to break 500,000 daily infections in the U.S. around July 9th.

This is the same prediction as last week, as the forecast was dead on. Yet, there is considerably uncertainty around this timing.

🧵3/6Longitudinal transmission, past 12 months and 1-month forecast
Read 6 tweets

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