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None of the studies of #COVID19 treatment use of serum taken from survivors (aka convalescent serum therapy) show positive results, & @US_FDA has stopped approving its use.
But @realDonaldTrump will announce a breakthru tonight.
MORE https://thehill.com/homenews/administration/513259-trump-to-announce-breakthrough-coronavirus-therapeutic-white-house">https://thehill.com/homenews/...
But @realDonaldTrump will announce a breakthru tonight.
MORE https://thehill.com/homenews/administration/513259-trump-to-announce-breakthrough-coronavirus-therapeutic-white-house">https://thehill.com/homenews/...
2/ This not new, just his insistence it works. No coincidence, I& #39;m sure, that it comes on the eve of the #RNCConvention2020 putting a positive spin on the #COVID19 crisis.
Here& #39;s what we know about convalescent therapy so far.
It might work: MORE https://www.statnews.com/2020/08/13/large-study-suggests-convalescent-plasma-can-help-treat-covid-19-with-caveats/">https://www.statnews.com/2020/08/1...
Here& #39;s what we know about convalescent therapy so far.
It might work: MORE https://www.statnews.com/2020/08/13/large-study-suggests-convalescent-plasma-can-help-treat-covid-19-with-caveats/">https://www.statnews.com/2020/08/1...
3/
But on Aug 19 the @NIH & @US_FDA urged a hold on use of the treatments, citing lack of clear evidence that it is beneficial. And it is not risk-free.
MORE https://www.nytimes.com/2020/08/19/us/politics/blood-plasma-covid-19.html">https://www.nytimes.com/2020/08/1...
But on Aug 19 the @NIH & @US_FDA urged a hold on use of the treatments, citing lack of clear evidence that it is beneficial. And it is not risk-free.
MORE https://www.nytimes.com/2020/08/19/us/politics/blood-plasma-covid-19.html">https://www.nytimes.com/2020/08/1...
4/ One study shows effective plasma therapy must be given very soon (before seroconversion) and must involve high titer NAbs. Otherwise, the dilution effect of 10-20 fold when plasma is given to a NAb positive patient makes it all rather pointless.
MORE https://www.medrxiv.org/content/10.1101/2020.07.01.20139857v1">https://www.medrxiv.org/content/1...
MORE https://www.medrxiv.org/content/10.1101/2020.07.01.20139857v1">https://www.medrxiv.org/content/1...
5/
A Texas study similarly found less mortality among plasma transfusion recipients IF they received treatment early in the disease process.
MORE https://ajp.amjpathol.org/article/S0002-9440(20)30370-9/fulltext?rss=yes">https://ajp.amjpathol.org/article/S...
A Texas study similarly found less mortality among plasma transfusion recipients IF they received treatment early in the disease process.
MORE https://ajp.amjpathol.org/article/S0002-9440(20)30370-9/fulltext?rss=yes">https://ajp.amjpathol.org/article/S...
6/
The largest plasma transfusion #COVID19 study, from the Mayo Clinic, treated 35,522 patients, seeing a small mortality benefit. Again, positive effects were only seen if patients were treated very early -- like, 3 days after seroconversion. https://www.medrxiv.org/content/10.1101/2020.08.12.20169359v1">https://www.medrxiv.org/content/1...
The largest plasma transfusion #COVID19 study, from the Mayo Clinic, treated 35,522 patients, seeing a small mortality benefit. Again, positive effects were only seen if patients were treated very early -- like, 3 days after seroconversion. https://www.medrxiv.org/content/10.1101/2020.08.12.20169359v1">https://www.medrxiv.org/content/1...
