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One Key Metric Shows How States' Outbreaks in The US Have Gotten Out of Control
The World Health Organisation recommends that governments institute a stay-at-home order if more than 5 percent of tests are coming back positive in a given region.
That's because a positivity rate over 5 percent indicates that the virus is spreading significantly through the community.
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 percent over the last week. That's the highest in the US.
Florida comes in second, at 19 percent, followed by South Carolina (17 percent), Mississippi (15 percent), and Texas (14 percent).
Five more states have positivity rates over 10 percent: Nevada (13 percent), Georgia (13 percent), Alabama (12 percent), Idaho (12 percent), Kansas (10 percent),
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 percent indicates an ongoing epidemic," he said. "Meaning the epidemic is spreading relatively fast. And 10 percent is not a small number. It's a huge number in any epidemic."
The World Health Organisation recommends that governments institute a stay-at-home order if more than 5 percent of tests are coming back positive in a given region.
That's because a positivity rate over 5 percent indicates that the virus is spreading significantly through the community.
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 percent over the last week. That's the highest in the US.
Florida comes in second, at 19 percent, followed by South Carolina (17 percent), Mississippi (15 percent), and Texas (14 percent).
Five more states have positivity rates over 10 percent: Nevada (13 percent), Georgia (13 percent), Alabama (12 percent), Idaho (12 percent), Kansas (10 percent),
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 percent indicates an ongoing epidemic," he said. "Meaning the epidemic is spreading relatively fast. And 10 percent is not a small number. It's a huge number in any epidemic."