1) Regulatory - FDA must remove unnecessary regulatory requirements
Most crucial: ~90% sensitivity against PCR in ASYmptomatics w/out allowing a Ct cutoff
By time asymptomatics are found w PCR, Ct is >30 & post-infectious
1/x
@EpiEllie@mlipsitch@vivek_murthy By requiring demonstrating sensitivity specifically in asymptomatics, FDA is confusing EUA application with showing physiology of the virus.
Many studies show asymptomatics have virus.
The tests care about virus, not symptoms. FDA is confusing this point.
2/x
We now have a completely confusing landscape where some #COVID19 tests are prescription and some are not.
This makes no sense. Particularly since one of the most technically challenging to use is the one authorized at-home OTC test.
4/x
@EpiEllie@mlipsitch@vivek_murthy Other major issues are need to allocate the financial resources both to help the companies scale capacity and to produce the tests.
If USG doesn't give grants now to help them scale, then they will charge much more $/test later to cover costs. More than initial build out.
5/x
But simply cannot afford it. It's pennies for the federal government, but $100M is a lot for any state.
So this needs to be an effort of the federal government first and foremost. Even if championed by the states.
6/x
@EpiEllie@mlipsitch@vivek_murthy Funding piece is crucial, which is why I've spent a lot of time lobbying congress to get it into the bill.
Unfortunately I failed this time around.
They vaguely worded it and suggested the states could each come together to do this. That's BS, must be central scaling
7/x
@EpiEllie@mlipsitch@vivek_murthy Also many physicians/scientists just can't see obvious problems with slow and infrequent PCR vs rapid frequent testing.
The rapid antigen tests caught all of the high viral load cases that were likely contagious and missed the low RNA level cases who were most likely beyond their contagious period.
This suggests the testing was simply too infrequent to catch the important cases.
2/x
At what point are we going to stop making the claim that these tests are too insensitive?
They are doing the job exactly as anticipated. Public health is not about diagnosing and isolating old COVID cases. It’s about identifying current contagious people.
3/3
That the test is being performed weekly is great. Perhaps people can order ahead. Still, with shipping, it will most likely be 3 days between the swab being used and result provided back. If it’s positive, that’s 3 days of walking around positive.
2/x
This is a good effort from Google.
But this sheds concrete light on the problems of delayed test results for an acute respiratory virus.
A 3 day wait erases ~50% of the EFFECTIVENESS of the test to stop transmission. A 6 day wait erases ~90% of the effectiveness
3/x
The study above, by @NiraPollock and others, is incredibly important because it proves that these tests do not care about your symptoms, they only care about the virus. And that they work in kids as well as adults.
The former issue is critically important...
2/
Currently @US_FDA requires that for these tests to be used at home OTC, they need to demonstrate explicitly that they work in asymptomatic people.
But this is completely unnecessarily burdensome - plus finding asymptomatic people shedding virus is very difficult!
3/
First at-home rapid test w FDA EUA! This is a great milestone! Congratulations to @EllumeHealth on this triumph. The EUA for this at-home test should be celebrated. I am supportive & have used it myself! I want to put this in context...
This is a terrific milestone. An OTC rapid test is a great advance. It means some will have access to much needed test to help know status, without going through barriers of an MD.
Since many are asking, this is not quite THE public health screening test I'm calling for.
2/10
Inside, @Ellume (right) has simple but powerful paper strip test. It requires battery, circuits, sensors, and bluetooth with a mobile phone. Thus, not quite THE mass public health screening test that will scale for frequent use by millions (i.e. vs simple one on left).