tresir2012
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Direct link to the study -"In a related development, the infectious disease modeling group at Imperial College London released its latest estimates yesterday for the United States and individual states. Its analysis suggests that the COVID-19 epidemic isn't under control across much of the United States, with the reproduction number still above the threshold of 1.0 in 24 states. The highest reproduction numbers cluster in the South and Midwest, where outbreaks are still developing.
The group urged states to take caution in relaxing current restrictions and warned that increased mobility following eased restrictions will lead to new spikes in COVID-19 activity, if all factors are kept constant, with a doubling of deaths or worse. Rapid testing, contact tracing, and behavioral precautions are key factors that could offset the resulting rise in transmission.
They also estimated that 4.1% (range 3.7% to 4.5%) of the US population has been infected, with wide variation among states, with a high of 16.6 % in New York. "Overall, we show that while all US states have substantially reduced their reproduction numbers, we find no evidence that any state is approaching herd immunity or that its epidemic is close to over," they wrote."
COVID-19 still rising in much of US; Brazil now 2nd hardest-hit nation
Report 23 - State-level tracking of COVID-19 in the United States
"Nationally, our estimates show that the percentage of individuals that have been infected is 4.1% [3.7%-4.5%], with wide variation between states. For all states, even for the worst affected states, we estimate that less than a quarter of the population has been infected; in New York, for example, we estimate that 16.6% [12.8%-21.6%] of individuals have been infected to date. Our attack rates for New York are in line with those from recent serological studies [1] broadly supporting our modelling choices.
There is variation in the initial reproduction number, which is likely due to a range of factors; we find a strong association between the initial reproduction number with both population density (measured at the state level) and the chronological date when 10 cumulative deaths occurred (a crude estimate of the date of locally sustained transmission). Our estimates suggest that the epidemic is not under control in much of the US: as of 17 May 2020, the reproduction number is above the critical threshold (1.0) in 24 [95% CI: 20-30] states. Higher reproduction numbers are geographically clustered in the South and Midwest, where epidemics are still developing, while we estimate lower reproduction numbers in states that have already suffered high COVID-19 mortality (such as the Northeast). These estimates suggest that caution must be taken in loosening current restrictions if effective additional measures are not put in place."
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