CDC and 11 states acknowledge mixing outcomes of viral and antibody assessments

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Eleven states additionally confirmed mixing viral and antibody check outcomes.

The CDC says it is planning to separate these numbers within the coming weeks, however consultants say the present methodology is unhelpful and doubtlessly deceptive.

That is as a result of antibody assessments aren’t used to diagnose present infections or decide whether or not somebody is doubtlessly contagious. As an alternative, they point out whether or not somebody has been uncovered to the virus previously.

Combining numbers from antibody and viral assessments pushes up the overall variety of assessments carried out within the US. However antibody assessments are sometimes supposed for most of the people — not simply individuals with suspected infections — to allow them to skew a key indicator of how the pandemic is progressing: the proportion of assessments that come again constructive.

The CDC’s methodology makes it seem that the US has larger capability to check than it actually does, a minimum of in the case of figuring out present infections.

At least 4 states combined numbers from two tests, possibly providing a misleading picture of coronavirus spread

“It’s not useful information, unless you have a political agenda that you’re trying to back up. That’s really the only reason to do that,” mentioned CNN medical analyst Dr. Celine Gounder, a professor of medication and infectious illnesses on the New York College College of Drugs.

“This is just one more example of why we’re very concerned that science is being suppressed at the CDC and is taking a back seat to political priorities in this administration,” she mentioned.

Whether or not the mixed numbers are coming from states and being republished by CDC — or whether or not the CDC is misconstruing the numbers itself — Gounder mentioned the information are regarding. The numbers could make it look like states have sufficient testing capability and are able to carry restrictions, when that may not be the case.

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“This is pretty basic molecular biology 101 that any college student who has studied this stuff would have some basic understanding of,” she mentioned. “So CDC epidemiologists know this.”

Information of the company combining viral and antibody assessments was first reported by Miami-based public radio station WLRN and within the Atlantic journal.

CDC spokeswoman Kristen Nordlund described the company’s apply to CNN on Thursday and confirmed it the following day.

“Initially, when CDC launched its website and its laboratory test reporting, viral testing (tests for current infection) were far more commonly used nationwide than serology testing (tests for past infection),” she mentioned in an electronic mail. “Now that serology testing is more widely available, CDC is working to differentiate those tests from the viral tests and will report this information, differentiated by test type, publicly on our COVID Data Tracker website in the coming weeks.”

Two very several types of coronavirus assessments

Viral assessments, or diagnostic assessments, are in a position to determine present infections. Typically referred to as PCR or antigen assessments, they search for indicators of lively an infection. A constructive check end result means somebody is doubtlessly contagious — though some assessments have accuracy issues.

Antibody assessments, in distinction, determine whether or not somebody has been contaminated by the virus previously, not whether or not they’re at the moment contaminated. Because the CDC states on its web site: “Antibody tests should not be used to diagnose someone as being currently sick with COVID-19.”

At present, the CDC says that about 12.9 million assessments have been reported within the US, though it cautions that not all assessments are reported to the company. Nonetheless, information from impartial labs suggests {that a} substantial variety of assessments carried out within the US are antibody assessments.

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Quest Diagnostics mentioned on Monday that it had carried out about 1 million antibody assessments. LabCorp, one other scientific laboratory, mentioned it has carried out greater than 700,000 as of Friday.

Each corporations say they’ve far larger capability to carry out antibody assessments than viral assessments.

Quest mentioned it may run 70,000 viral assessments per day, in comparison with 200,000 antibody assessments. LabCorp says it may run greater than 75,000 viral assessments a day, in comparison with greater than 200,000 antibody assessments.

The distinction between the assessments issues, as a result of the % of assessments that come again constructive — the so-called positivity price — is a crucial indicator for whether or not states are able to reopen. It is a signal of the progress that the nation is, or is not, making on the virus — and antibody assessments can complicate the image.

Bending the curve

The White Home’s personal reopening tips, for instance, name for a “[downward] trajectory of positive tests as a percent of total tests within a 14-day period (flat or increasing volume of tests).”

Whereas antibody assessments are helpful for understanding how prevalent the virus has been — and whether or not individuals may need some kind of immunity sooner or later — they do not replicate the present state of the pandemic.

“Many states are using numbers of diagnostic tests per capita and the proportion of positive test results as key metrics for reopening decisions, so adding a whole bunch of other tests that do not measure the present state of the pandemic to the mix is unhelpful and creates confusion,” Invoice Hanage, an epidemiology professor at Harvard College’s College of Public Well being, instructed CNN.

“Fortunately, most, though not all, states are reporting these results separately, which is the data that should be used when making decisions about reopening,” he mentioned.

Some states acknowledge mixing collectively the numbers

Contacted by CNN, public well being officers in most states mentioned they have not mixed numbers from antibody and diagnostic assessments. However 11 states reported mixing the numbers collectively in some unspecified time in the future.

Colorado, Delaware, Georgia, Maine, Mississippi, Missouri, New Hampshire, Pennsylvania, Texas, Vermont and Virginia have all performed so, however some states have stopped the apply.

Officers in Virginia and Vermont mentioned they’ve mounted the problem. New Hampshire mentioned it solely reported the mixed numbers for a day, and Colorado mentioned it did so for a few week. Maine now separates out its numbers as effectively.

Texas mentioned it will likely be separating the numbers this week, and Georgia says it is working to supply larger transparency. Of the 50 states and the District of Columbia, CNN has not but obtained responses from Alaska, Arizona, Florida, Iowa, and Kentucky.

CNN’s Renee Baharaeen, Shawn Nottingham and Konstantin Toropin contributed to this report.


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