What’s kept cases officially at zero in these 200 counties?

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In just four months, the deadly COVID-19 virus has infiltrated every state and major U.S. city. But a scattering of remote counties continue without a single reported case, according to a USA TODAY analysis.

As of May 15, a total of 231 of 3,143 counties had no reported cases.

The list is getting shorter by the day, though. In the first half of May alone, 40 counties went from zero recorded cases of the virus to at least one.

Georgia started the month with two zero-case counties. Now there is none. Tennessee also had two counties with no reported cases on May 1; two weeks later, only one remained. Iowa went from eight counties with no cases to only four by mid-May.

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Counties where there are no reported cases of COVID-19*

The long stretch without coronavirus cases in some counties likely reflects

London has just 24 new coronavirus cases a day

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Coronavirus Article Bar with counter

Fewer than 24 people are catching coronavirus each day in London, new modelling suggests, with forecasts predicting the virus could be wiped out in the capital within a fortnight.

Analysis by Public Health England and Cambridge University calculates that the “R” reproduction rate has fallen to 0.4 in London, with the number of new cases halving every 3.5 days.

If cases continue to decrease at the current rate, the virus will be virtually eliminated in the capital by the end of the month, raising questions about whether the strict lockdown measures would need to continue.

On March 23, at the peak of contagion when lockdown was announced, 213,000 people a day caught the virus in London, according to the research.

That fell dramatically as soon as restrictions were brought in, tumbling below 10,000 by April 7. The number of deaths is halving roughly