Twitter Threads

Last Updated: March 24, 2021

This page contains a comprehensive list of Twitter threads by Youyang Gu (@youyanggu) that are related to COVID-19. Due to the fast-paced environment of COVID-19 developments and the site’s limited team (of one), Twitter is Youyang’s preferred method of posting announcements, sharing results and fasciliating discussion. Below is a comprehensive list of our Tweets since late April.

Dates in bold indicates threads that Youyang personally recommends reading.

Table of Contents

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Original Research

February 24, 2021 - Return to normal
February 22, 2021 - Association of university in-person instruction with cases and deaths (CDC paper review)
February 17, 2021 - Predictive power of political lean on the fall surge
January 7, 2021 - Association between prior population immunity and the fall wave
December 16, 2020 - Effectiveness of mask mandate in Kansas (CDC paper review)
December 3, 2020 - Estimating true infections revisited
August 10, 2020 - Role of immunity vs behavior vs interventions (Louisiana case study)
August 5, 2020 - Estimating true infections
July 24, 2020 / July 31, 2020 - Implied infection fatality rate
June 13, 2020 - Subway ridership analysis
May 20, 2020 - OpenTable restaurant occupancy analysis

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Personal

March 12, 2021 - Last update and final thoughts
March 1, 2021 - Hopeful
February 20, 2021 - Grateful
December 18, 2020 - A dose of optimism

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Miscellaneous

March 11, 2021 - Equity in vaccination distribution
March 10, 2021 - Clarifications of CDC mask mandate study
March 10, 2021 - Censorship of WSJ op-ed
March 9, 2021 - How to be like Connecticut
March 4, 2021 - Connecticut dropping restrictions: lack of coverage
March 4, 2021 - Criticism is easy, solutions are hard
March 3, 2021 - Predictable storyline
March 3, 2021 - Vaccination milestone
March 2, 2021 - Dangers of data / school reopenings
February 26, 2021 - One year later: winding down model
February 23, 2021 - NYT unreasonable model assumptions
February 21, 2021 - CDC vaccination methodology change
February 19, 2021 - Bloomberg Businessweek profile
February 18, 2021 - COVID-19 variants
February 11, 2021 - Overblown focus on herd immunity
February 9, 2021 - Interview with Eric Topol on Medscape
February 5, 2021 - US and UK: vaccination leaders
February 4, 2021 - CDC vaccination trends data
January 28, 2021 - CDC vaccination data
January 25, 2021 - CDC infections estimates correction
January 22, 2021 - Vaccinated vs infected - first 10 states
January 14, 2021 - CDC website error
December 31, 2020 - Delaying a second dose
December 30, 2020 - Peak may be yet to come
December 29, 2020 - Major flaws in CDC infections estimates (CDC paper review)
December 17, 2020 - Call for donations
December 15, 2020 - Vaccination misinformation
December 14, 2020 - Vaccination side effects
December 11, 2020 - Vaccination priority
December 9, 2020 - COVIDhub Ensemble model performance
November 24, 2020 - Illinois vs Florida media bias
October 1, 2020 - Community vs individual risk
September 28, 2020 - Six months later: winding down model
September 4, 2020 - Forecasting uncertainty
August 27, 2020 - Following the science
August 13, 2020 - Talk announcement
August 12, 2020 - Common pitfalls when estimating true infections (Florida)
July 19, 2020 - CDC Forecast Hub
July 11, 2020 - Rise in infections/deaths
July 9, 2020 - Bottlenecks and delays in testing
July 3, 2020 - Sample comparison with IHME
July 2, 2020 - Summer wave
June 25, 2020 - Exponential growth trivia
June 24, 2020 - Open sourcing SEIR simulator
June 21, 2020 - IHME’s lack of representation
June 12, 2020 - IHME September projections
June 9, 2020 - Probable deaths reporting
May 29, 2020 - Self-quarantine scenario
May 16, 2020 - Seroprevalence in Stockholm
May 16, 2020 - New feature: Rt over time
May 15, 2020 - Shopping simulation
May 14, 2020 - Social distancing 1 week earlier scenario
May 13, 2020 - New feature: No reopenings
May 2, 2020 - NY serology survey
April 30, 2020 - Infection fatality rate (IFR)
April 29, 2020 - Model added to CDC website
April 28, 2020 - NYC subway ridership analysis
April 26, 2020 - Rt estimates
April 25, 2020 - Death milestone probabilities
Early April 2020 - Tweets from early April

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Maps

February 16, 2021
November 21, 2020
November 20, 2020
July 13, 2020
June 27, 2020
June 24, 2020
June 15, 2020
June 8, 2020
June 12, 2020
June 6, 2020
June 5, 2020

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Vaccination Projections Model

February 25, 2021 - Feb 25 Weekly Update
February 16, 2021 - Feb 16 Weekly Update
February 10, 2021 - Feb 10 Weekly Update
February 3, 2021 - Feb 3 Weekly Update
January 27, 2021 - Jan 27 Weekly Update
January 20, 2021 - Jan 20 Weekly Update
January 12, 2021 - New feature: plotting of vaccination statuses for states
January 11, 2021 - Jan 11 Weekly Update
December 28, 2020 - Vaccination progress update
December 10, 2020 - Model announcement

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Infections Estimates Model

January 4, 2021 - New feature: US county summary
December 3, 2020 - Model methodology
December 1, 2020 - New feature updates
November 23, 2020 - New feature: County-level infections estimates
November 18, 2020 - Model announcement

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Death Forecasting Model

Model/Projection Updates

October 6, 2020
September 30, 20200
September 22, 2020
September 15, 2020
September 9, 2020
September 1, 2020
August 25, 2020
August 18, 2020
July 29, 2020
July 23, 2020
July 17, 2020
July 8, 2020
June 19, 2020
June 11, 2020
June 1, 2020
May 27, 2020
May 26, 2020
May 20, 2020
May 13, 2020
May 1, 2020

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Model Evaluations

July 14, 2020
June 29, 2020 - Baseline comparison with IHME
June 23, 2020
June 17, 2020 - Open source model evaluation
May 28, 2020 - Accuracy of CNN projections
May 18, 2020
May 17, 2020
May 9, 2020
May 4, 2020
April 27, 2020
April 24, 2020

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States Testing Targets

June 7, 2020
May 30, 2020
May 24, 2020
May 17, 2020