Adoption of strategies that aim to allow people to test themselves, privately,simply, at home, 1-2x/week could help suppress outbreaks quickly. Especially in context of other public health measures.

~10M/day to achieve herd effects and drop incidence
healthaffairs.org/do/10.1377/hbl…
We don’t need perfect compliance, at all. We just need decent compliance - we can achieve this. Like herd immunity, we don’t need this to be everyone, just enough people to drop R<1. I estimate 10% of people in a community would test at home per day. So need not have perfection
We still need reporting so public health officials can keep track

No problem... we work w Google, Apple and whoever else to make voluntary reporting easy as a FaceTime call. If I can see my twin brother 2000 miles away w the push of a button, I should be able to report a result
What will a program like this cost the US - probably $10-20B. (That includes messaging/logistics - $5-10B just for the tests). Pennies compared to the cost of the virus thus far.
Also, the purpose of this sort of public health screening is to suppress whole outbreaks vs stopping all cases. These are different. Most ppl think in terms of individual cases, but here the broader idea is to focus on ensuring stopping every outbreak, not every case....
If we can do this, maybe sooner rather than later we can find ourselves in position where we can go back to work and resume normalcy bc incidence could get very low/absent in a community.

testing could then slow down. Survey wastewater. If cases return, start the testing again

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More from @michaelmina_lab

8 Nov
Frequent testing is needed to detect people early before infecting others. They must be highly scalable and for buy in, very convenient - i.e. home use

10M Rapid tests/day (i.e. antigen bc scalable / simple) can form the foundation to build back economy

theatlantic.com/health/archive…
Frequent tests alone won’t be the end all be all of this pandemic. Not by a long shot. These can greatly reduce odds of transmission - when used en masse, odds of onward transmission (i.e. Rt) can plummet.

To work, also need huge social/economic safety nets, + masks/distancing.
Although new administration will not officially start till January, we have options now. @JoeBiden and team led by @vivek_murthy can start now to engage manufacturing and begin planning/building these at scale w promise of payment once in office, as one example.
Read 5 tweets
7 Nov
On frequent wide scale rapid testing programs as foundation to slow #COVID19

“Total cost, in tens of billions, would still be far less than the many trillions of dollars of... continued economic loss”

True!

(One comment about the headline...
1/x)
forbes.com/sites/williamh…
Headline says as much as 1M Americans getting COVID daily. This is based on a back of the envelope calculation

We know that only 10% of cases may be diagnosed. So if we have 100k diagnosed daily, then the thinking is that x10 = 1 million

But this misses a crucial piece

2/x
Even though 100k+ new cases DETECTED daily, and we can multiply by 10 for underdiagnosis and get 1M... this is not NEW cases happening daily. This is prevalence of virus positivity daily....

To convert to daily INCIDENCE (Ie new infections daily) takes another step

3/x
Read 6 tweets
5 Nov
A new article in ⁦@nytimes⁩ states rapid tests falter in asymptomatics

Warning of their use for asymptomatic screening

Says: among random asymptomatic #COVID19 screens, Rapid Tests caught only 32% of PCR +ve people

This is misleading...

1/

nytimes.com/2020/11/02/hea…
Tests have to be matched to their purpose. If doing asymptomatic screening - you are looking for INFECTIOUS people.

Importantly, MOST (~70%+) of the time someone is PCR +ve, they are POST-infectious!

2/
Since antigen tests meant to detect viable/live virus, we only EXPECT them to be positive about 30% of the time of PCR

Thus, finding 32% of positive PCR tests in random asymptomatic screening is absolutely the EXPECTED result for a test looking for infectious people

3/
Read 14 tweets
3 Nov
NEW terrific study on rapid tests

The importance of this figure canNOT be overstated!

Rapid tests caught 80% of PCR positives but all missed had very low viral loads

Thus, as expected it will successfully capture ppl most likely to be contagious

1/

medrxiv.org/content/10.110…
The specificity of the PanBio, BinaxNow and SD Biosensor tests (the three leading manufactured rapid tests in the world) are looking very good!

In this paper, specificity was 100% in >400 samples... thus >99.2%

Now multiple studies showing very high specificity!

2/
The sensitivity metrics AND specificity metrics are now completely in alignment with what we have proposed for frequent rapid testing that can control outbreaks without vaccines.

medrxiv.org/content/10.110…

3/
Read 5 tweets
3 Nov
Can contact tracing work for #COVID19?

Much effort assumes contact tracing works for COVID - surveillance testing assumes so

I’ve had major concerns - this paper reinforces it.

For fast pandemics, we cant act only on what has been successful before

1/

jamanetwork.com/journals/jamai…
In this paper, 791 #COVID19 positive people were contact traced AND universal testing was recommended for their close contacts.

Ultimately only 120 people were discovered.

2/
If COVID has an R of ~1.3… those 791 people perhaps led to >1000 additional cases.

If 120 were discovered... ~900 were not.
And this was an organized operation.

3/
Read 13 tweets
29 Oct
In light of the recent article from the UK discussing antibody waning - it’s important to read additional reports that show that while the antibodies are waning, they are not disappearing. This is expected and the natural course of an immune response.

1/
After a primary infection, antibodies go sky high - along with the cells that produce them - and then after the virus clears, those cells must subside and the antibody production falls. Antibodies this wane, almost by definition, after a primary infection

2/
Importantly, the antibodies do go down and, like in the UK report may fall below the limit of detection. But like in the @SciImmunology paper above by @florian_krammer among others, when a more sensitive test is used, they often remain detectable...

3/
Read 10 tweets

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