COVID-19 -- March 28 update
Posted: Sat Mar 28, 2020 5:44 am
Update as of early 3/28/20.
Total U.S. cases -- 104,256 (up by over 18,000 from 3/27)
Active cases -- 100,027
Deaths -- 1,704
CFR -- 1.6%
The case curves are still pointing steeply upward (which most expected), signifying that we remain in the escalation phase. Also, clusters are developing in some cities that appear to have the potential to become major hot spots (e.g., New Orleans). Hopefully, mitigation measures will begin to have an effect on the curves soon. Parenthetically, consider what the numbers would be today had we not started the aggressive mitigation campaign about 10-11 days ago. That has bought us some time, while the country is ramping production/delivery of PPE and ventilators, constructing/converting facilities, which is crucial to keeping the healthcare system from becoming overwhelmed. But, in some places we are approaching capacity of skilled health care workers (as their ranks are depleted by having to quarantine following exposure/becoming symptomatic (I know one doctor and her husband, both symptomatic)-- which is becoming a problem). Many places have already mobilized medical students, residents, doctors/nurses in unrelated specialties, retirees, etc., so that source of supply is already being tapped. Also, the CFR now is up slightly, despite the fact that much more testing has been done. Hopefully that will reverse and decline as even more testing is done.
There has been good news, though.
The lead proponent of the Imperial College model that drove the models being used in the UK and USA concluded that the number of unreported cases that involved few or no symptoms has likely been much higher than was assumed in the original model. That is, he now believes there have been many more cases that have not been discovered/reported (and not resulted in deaths).
If he is right, it would be good in two ways. First, our Case Fatality Rate (CFR) would go down from the originally estimated 2-3%, perhaps below 1% or even lower. Second, it would mean that many tens or hundreds of thousands of Americans have unknowingly already been infected/recovered and likely developed antibody immunity, bringing us meaningfully closer to "herd immunity" but without having strained the health care system and without having taken more lives in the process. And, if we are closer to herd immunity for that reason, we will reach it much earlier than has been estimated, and with less loss of life and less use of healthcare resources and burden. We should hope he is correct.
We won't know if this change is predictive of what will happen, however, until we can do mass testing to find out who/how many have been infected already.
Also, excellent preliminary results continue to be reported regarding off-label use of hydroxychloroquine to lessen severity of disease and length of stay. Hopefully in a few weeks we will have results of a controlled, randomized, blinded clinical trial that will confirm these preliminary reports and observational studies. We should appreciate the patients willing to enroll, as those who receive placebo will be short-changed if the drug actually works (as many doctors are reporting they believe is happening with their other patients). That means, however, that from a statistical perspective, there will be an interim examination of the data and, if the Data Monitoring Committee finds statistical significance of efficacy before scheduled trial completion, they would recommend an early halt of the trial. It would be unethical, under such circumstances, to continue giving placebo to trial enrollees who are randomized to the control arm of the trial. My uninformed guess is that we might hear of an interim look in 2-3 weeks.
Other therapeutic candidates (mostly, if not exclusively, several not previously approved for other indications, unlike hydroxychloroquine is) are also now in testing (e.g., remdesivir, et al). They, however, may have to undergo more testing than hydroxychloroquine in order to study safety more thoroughly.
Another bit of good news is the rapid development of testing capability, particularly point of care testing, which is about to ramp mass production. That would help in multiple ways, from earlier diagnosis and quarantine (reducing spread), to reduced use of PPE and other resources (on patients who, when tested, will be immediately known to be negative, despite symptoms), to facilitating study of spread concentrations and patterns (informing, hopefully, when and where easing of restrictions can safely occur).
Keep your fingers crossed. If you are religious, say a prayer for our courageous health care providers and their families. Our debt to them will be more than we could ever repay.
Total U.S. cases -- 104,256 (up by over 18,000 from 3/27)
Active cases -- 100,027
Deaths -- 1,704
CFR -- 1.6%
The case curves are still pointing steeply upward (which most expected), signifying that we remain in the escalation phase. Also, clusters are developing in some cities that appear to have the potential to become major hot spots (e.g., New Orleans). Hopefully, mitigation measures will begin to have an effect on the curves soon. Parenthetically, consider what the numbers would be today had we not started the aggressive mitigation campaign about 10-11 days ago. That has bought us some time, while the country is ramping production/delivery of PPE and ventilators, constructing/converting facilities, which is crucial to keeping the healthcare system from becoming overwhelmed. But, in some places we are approaching capacity of skilled health care workers (as their ranks are depleted by having to quarantine following exposure/becoming symptomatic (I know one doctor and her husband, both symptomatic)-- which is becoming a problem). Many places have already mobilized medical students, residents, doctors/nurses in unrelated specialties, retirees, etc., so that source of supply is already being tapped. Also, the CFR now is up slightly, despite the fact that much more testing has been done. Hopefully that will reverse and decline as even more testing is done.
There has been good news, though.
The lead proponent of the Imperial College model that drove the models being used in the UK and USA concluded that the number of unreported cases that involved few or no symptoms has likely been much higher than was assumed in the original model. That is, he now believes there have been many more cases that have not been discovered/reported (and not resulted in deaths).
If he is right, it would be good in two ways. First, our Case Fatality Rate (CFR) would go down from the originally estimated 2-3%, perhaps below 1% or even lower. Second, it would mean that many tens or hundreds of thousands of Americans have unknowingly already been infected/recovered and likely developed antibody immunity, bringing us meaningfully closer to "herd immunity" but without having strained the health care system and without having taken more lives in the process. And, if we are closer to herd immunity for that reason, we will reach it much earlier than has been estimated, and with less loss of life and less use of healthcare resources and burden. We should hope he is correct.
We won't know if this change is predictive of what will happen, however, until we can do mass testing to find out who/how many have been infected already.
Also, excellent preliminary results continue to be reported regarding off-label use of hydroxychloroquine to lessen severity of disease and length of stay. Hopefully in a few weeks we will have results of a controlled, randomized, blinded clinical trial that will confirm these preliminary reports and observational studies. We should appreciate the patients willing to enroll, as those who receive placebo will be short-changed if the drug actually works (as many doctors are reporting they believe is happening with their other patients). That means, however, that from a statistical perspective, there will be an interim examination of the data and, if the Data Monitoring Committee finds statistical significance of efficacy before scheduled trial completion, they would recommend an early halt of the trial. It would be unethical, under such circumstances, to continue giving placebo to trial enrollees who are randomized to the control arm of the trial. My uninformed guess is that we might hear of an interim look in 2-3 weeks.
Other therapeutic candidates (mostly, if not exclusively, several not previously approved for other indications, unlike hydroxychloroquine is) are also now in testing (e.g., remdesivir, et al). They, however, may have to undergo more testing than hydroxychloroquine in order to study safety more thoroughly.
Another bit of good news is the rapid development of testing capability, particularly point of care testing, which is about to ramp mass production. That would help in multiple ways, from earlier diagnosis and quarantine (reducing spread), to reduced use of PPE and other resources (on patients who, when tested, will be immediately known to be negative, despite symptoms), to facilitating study of spread concentrations and patterns (informing, hopefully, when and where easing of restrictions can safely occur).
Keep your fingers crossed. If you are religious, say a prayer for our courageous health care providers and their families. Our debt to them will be more than we could ever repay.