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Health & Fit A key metric — the share of coronavirus tests coming back positive — shows how states' outbreaks have gotten out of control

04:10  08 july  2020
04:10  08 july  2020 Source:   businessinsider.com

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How many people have the coronavirus in the United States ? More than two months into the country’s outbreak , this remains the There is clearly some group of Americans who have the coronavirus but who don’t show up in official figures. Now, using a statistic that has just become reliable, we can

“It came back positive ,” a mask-wearing Bolsonaro told a handpicked group of reporters on Tuesday The Republican party will provide mandatory coronavirus testing at its national convention in The border between Australia’s two most populous states is to close on Wednesday after a spike

a group of people standing on a sidewalk: People wait for their testing at a walk-in and drive-thru coronavirus testing site in Miami Beach, Florida on June 24, 2020. CHANDAN KHANNA/AFP via Getty Images © CHANDAN KHANNA/AFP via Getty Images People wait for their testing at a walk-in and drive-thru coronavirus testing site in Miami Beach, Florida on June 24, 2020. CHANDAN KHANNA/AFP via Getty Images
  • The US significantly scaled up its COVID-19 testing capacity after early missteps and prolonged delays.
  • As coronavirus cases in the US surge, one of the most important metrics to track a region's outbreak is its positivity rate: the share of tests that come back positive.
  • The WHO recommends stay-at-home orders if more than 5% of a region's tests come back positive over two weeks.
  • But 28 states have positivity rates above that threshold.
  • Visit Business Insider's homepage for more stories.

The US's number of new COVID-19 cases grew by 27% last week compared to the week before.

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President Donald Trump has suggested that the higher numbers are simply the product of increased testing, since more widely available diagnostic testing leads more cases to be caught and confirmed.

The US has significantly ramped up testing — it went from testing about 110,000 people per day on March 29 to about 640,000 on July 4. But that is not the primary reason for the recent spike in cases.

"The surge numbers are real," Dr. Irwin Redlener, director of the Columbia University National Center for Disaster Preparedness, told NBC News.

Although testing does capture more cases, he said, "to deny the fact that we're having an ongoing pandemic with continued spread is contrary to all evidence that we have and everything that we know about the behavior of the virus."

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Average Daily Coronavirus Tests in the U.S. There is variation in the rate of testing and positive results among states , but most need to administer more tests to get to the level the researchers Notes: Testing levels shown are a 7-day moving average. Reporting methods and regularity can vary.

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One metric can easily show whether increased testing is to blame for higher case counts: the positivity rate, the portion of diagnostic tests that come back positive over a given period of time. If testing is increasing and the number of new daily cases in a community is staying flat, the positivity rate should go down.

But that's not the case in 27 states, where positivity rates are going up, according to data from Johns Hopkins University.

In Idaho, for example, the average positivity rates from July 1 to 7 was 12%, where as it was 7% from June 14 to 21, and just 3% from June 1 to 7.

In South Carolina, the seven-day positivity-rate is around 17%. A month ago, on June 7, it was 6%.

This graph shows how six states' positivity rates have changed over time. The charts show seven-day rolling averages, meaning the rate shown on each day is an average of the previous week's positivity percentage.

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The United States is rapidly approaching 3 million positive coronavirus cases according to the Johns Hopkins University COVID-19 tracker, as the Saag said that even amid spiking case counts, there is a “window of opportunity” to get coronavirus under control . The infectious disease expert said we

a close up of a map: Yuqing Liu/Insider © Yuqing Liu/Insider Yuqing Liu/Insider

Rising positivity rates indicate that the virus' spread is accelerating within a community, and that an outbreak could be spiraling out of control. Generally, the spikes in the charts in March reflect the period of time when testing was limited and tests were mostly reserved for symptomatic patients with severe cases.

Positivity rates tell the truth about an outbreak

The World Health Organization recommends that governments institute a stay-at-home order if more than 5% of tests are coming back positive in a given region.

That's because a positivity rate over 5% indicates that the virus is spreading significantly through the community.

"This target is based on the experience of countries that have driven their numbers of cases down and largely stopped viral spread. Many places, such as South Korea, Australia and New Zealand have been keeping their positivity much lower — at 2% or less," Dr. Jennifer Nuzzo, an epidemiologist with the Johns Hopkins school of public health, wrote in a Washington Post op-ed.

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The state ’s positivity rate — the percentage of overall coronavirus tests that come back positive outbreak in March. Many of Houston’s hospitals have already begun beefing up staff, and getting workers At least 91,894 cases of coronavirus have been recorded in Arizona to date, reaching a

Share on Twitter. Share via Email. New South Wales in Australia has reported 14 new cases of coronavirus , all in returned travellers who are in hotel quarantine. The latter is a key indicator of community spread that experts refer to as the positivity rate.

Currently, however, 28 US states are seeing positivity rates above that threshold.

Arizona, whose total case count passed 50,000 on June 21 then doubled to more than 100,000 in the following two weeks, had a positivity rate of 25% over the last week. That's the highest in the US. Florida comes in second, at 19%, followed by South Carolina (17%), Mississippi (15%), and Texas (14%). Five more states have positivity rates over 10%: Nevada (13%), Georgia (13%), Alabama (12%), Idaho (12%),  Kansas (10%),

Dr. Hongjie Liu, chair of the department of epidemiology and biostatistics at the University of Maryland, told the Virginia Mercury in May that positivity rates serve as an indicator of how fast the virus is spreading.

"10% indicates an ongoing epidemic," he said. "Meaning the epidemic is spreading relatively fast. And 10% is not a small number. It's a huge number in any epidemic."

That high a positivity rate, he added, "implies that the risk for other people to acquire the virus is high."

States use positivity rates to make public-health decisions

a person wearing a hat talking on a cell phone: Coronavirus testing in Jericho, New York on April 22, 2020. J. Conrad Williams, Jr./Newsday RM via Getty Images © J. Conrad Williams, Jr./Newsday RM via Getty Images Coronavirus testing in Jericho, New York on April 22, 2020. J. Conrad Williams, Jr./Newsday RM via Getty Images

When positivity rates rise over time in a particular region, that's a sign an area is becoming a hotspot. By that logic, some states are using positivity rates as a metric to determine whether it's safe to reopen businesses, transit, and public spaces.

In early May, Texas Gov. Greg Abbott said any positivity rate over 10% was cause for alarm; when the state's overall rate surpassed that at the end of June, Abbott paused Texas' reopening plan. California considers a positivity rate of 8% to be a safe level for counties to reopen.

Positivity rates go down, of course, once an epidemic is under control and fewer people start testing positive, or when testing expands at a rate faster than the virus can spread.

However, the US faces major hurdles in ramping up testing to match this new surge in cases. Many states face a shortage of necessary supplies and delays in processing tests due to backlogs at laboratories. Meanwhile, the country is on the cusp of a grim new milestone: 3 million infections.

Read the original article on Business Insider

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