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Most of these people are not likely to be contagious, and identifying them may contribute to bottlenecks that prevent those who are contagious from being found in time.

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But researchers say the solution is not to test less, or to skip testing people without symptoms, as recently suggested by the Centers for Disease Control and Prevention. Instead, new data underscore the need for more widespread use of rapid testseven if they are less sensitive. Michael Mina, an epidemiologist at the Harvard T. Chan School of Public Health, referring to the C. In what may be a step in this direction, the Trump administration announced on Thursday that it would purchase million rapid tests.

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The most widely used diagnostic test for the new coronavirus, called a PCR test, provides a simple yes-no answer to the question of whether a patient is infected. Mina said. The PCR test amplifies genetic matter from the virus in cycles; the fewer cycles required, the greater the amount of virus, or viral load, in the sample. The greater continue reading viral load, the more likely the patient is to be contagious.

This number of amplification cycles needed to find the virus, called the cycle threshold, is never included in the results sent to doctors and coronavirus patients, although it could tell them how infectious the patients are. In three sets of testing data that include cycle thresholds, compiled by officials in Massachusetts, New York and Nevada, up to 90 percent of people testing positive carried barely any virus, a review by The Times found. On Thursday, the United States recorded 45, new coronavirus cases, according to a database maintained by The Times. If the rates of contagiousness in Massachusetts and New York were to apply nationwide, then perhaps only 4, of those people may actually need to isolate and submit to contact tracing.

One solution would The discussion included The decision taking The to adjust the cycle threshold used now to decide that a patient is infected. Most tests set the limit at 40, a few at This means that you are positive for the coronavirus if the test process required up to 40 cycles, or 37, to detect the virus. Tests with thresholds so high may detect not just live virus but also genetic fragments, leftovers from infection that pose no particular risk — akin to finding a hair in a room long after a person has left, Dr.

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Any test with a cycle threshold above 35 is too sensitive, agreed Juliet Morrison, a virologist at the University of California, Riverside. A more reasonable cutoff would be 30 to 35, she added.

Mina said he would set the figure at 30, or even less. The C. Officials at some state labs said the C. A spokeswoman for the lab said testers did not have access to the precise numbers. This amounts to an enormous missed opportunity to learn more about the disease, some experts said. In July, the lab identified positive tests, based on a threshold of 40 cycles.

With a cutoff of 35, about 43 percent of those tests would no longer qualify as positive.

About 63 percent would no longer be judged positive if the cycles were limited to ]