I’m deeply saddened to learn that Dr Joseph Sonnabend, one of the most important figures in the history of AIDS, died yesterday. I spent time with him in 2018 for one of the last interviews he ever gave. Let me tell you about this man and what he did:
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You gotta think about this one carefully!
Imagine you go to the doctor and get tested for a rare disease (only 1 in 10,000 people get it.)
The test is 99% effective in detecting both sick and healthy people.
Your test comes back positive.
Are you really sick? Explain below 👇
The most complete answer from every reply so far is from Dr. Lena. Thanks for taking the time and going through
You can get the answer using Bayes' theorem, but let's try to come up with it in a different —maybe more intuitive— way.
👇
Here is what we know:
- Out of 10,000 people, 1 is sick
- Out of 100 sick people, 99 test positive
- Out of 100 healthy people, 99 test negative
Assuming 1 million people take the test (including you):
- 100 of them are sick
- 999,900 of them are healthy
👇
Let's now test both groups, starting with the 100 people sick:
▫️ 99 of them will be diagnosed (correctly) as sick (99%)
▫️ 1 of them is going to be diagnosed (incorrectly) as healthy (1%)
👇
Imagine you go to the doctor and get tested for a rare disease (only 1 in 10,000 people get it.)
The test is 99% effective in detecting both sick and healthy people.
Your test comes back positive.
Are you really sick? Explain below 👇
The most complete answer from every reply so far is from Dr. Lena. Thanks for taking the time and going through
Really doesn\u2019t fit well in a tweet. pic.twitter.com/xN0pAyniFS
— Dr. Lena Sugar \U0001f3f3\ufe0f\u200d\U0001f308\U0001f1ea\U0001f1fa\U0001f1ef\U0001f1f5 (@_jvs) February 18, 2021
You can get the answer using Bayes' theorem, but let's try to come up with it in a different —maybe more intuitive— way.
👇

Here is what we know:
- Out of 10,000 people, 1 is sick
- Out of 100 sick people, 99 test positive
- Out of 100 healthy people, 99 test negative
Assuming 1 million people take the test (including you):
- 100 of them are sick
- 999,900 of them are healthy
👇
Let's now test both groups, starting with the 100 people sick:
▫️ 99 of them will be diagnosed (correctly) as sick (99%)
▫️ 1 of them is going to be diagnosed (incorrectly) as healthy (1%)
👇
I think @SamAdlerBell in his quest to be the contrarian on Fauci gets several things wrong here. 1/
First, the failure last year actually was driven by the White House, the #Trump inner circle. Watch what's happening now, the US' scientific and public health infrastructure is creaking back to life. 2/
I think Sam underestimates the decimation of many of our health agencies over the past four years and the establishment of ideological control over them during the pandemic. 3/
I also am puzzled why Tony gets the blame for not speaking up, etc. Robert Redfield, Brett Giroir, Deb Birx, Jerome Adams, Alex Azar all could have done the same. 4/
Several of these people Bob Redfield, Brett Giroir, Alex Azar were led by craven ambition, Jerome Adams by cowardice, but I do think Deb Birx and Tony tried as institutionalists, insiders to make a difference. 5/
— Matthew Yglesias (@mattyglesias) January 30, 2021
First, the failure last year actually was driven by the White House, the #Trump inner circle. Watch what's happening now, the US' scientific and public health infrastructure is creaking back to life. 2/
I think Sam underestimates the decimation of many of our health agencies over the past four years and the establishment of ideological control over them during the pandemic. 3/
I also am puzzled why Tony gets the blame for not speaking up, etc. Robert Redfield, Brett Giroir, Deb Birx, Jerome Adams, Alex Azar all could have done the same. 4/
Several of these people Bob Redfield, Brett Giroir, Alex Azar were led by craven ambition, Jerome Adams by cowardice, but I do think Deb Birx and Tony tried as institutionalists, insiders to make a difference. 5/
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Krugman is, of course, right about this. BUT, note that universities can do a lot to revitalize declining and rural regions.
See this thing that @lymanstoneky wrote:
And see this thing that I wrote:
And see this book that @JamesFallows wrote:
And see this other thing that I wrote:
One thing I've been noticing about responses to today's column is that many people still don't get how strong the forces behind regional divergence are, and how hard to reverse 1/ https://t.co/Ft2aH1NcQt
— Paul Krugman (@paulkrugman) November 20, 2018
See this thing that @lymanstoneky wrote:
And see this thing that I wrote:
And see this book that @JamesFallows wrote:
And see this other thing that I wrote: