Coronavirus: What's behind alarming new US outbreaks? As coronavirus outbreaks are slowly brought to heel in many places around the world, the US is among a handful of countries facing a surge of new infections. More than two dozen states are now seeing increases in new cases over the last 14 days. Of these, Texas, Florida, Arizona and California have emerged as the country's latest virus epicentres. But while cases are clearly rising, state leaders and health experts are divided on the cause. Here's a look at these four US hotspots, the facts and figures raising alarm, and the theories that may help explain each surge. What about testing? First, it's important to note that across the US, more efficient testing has played some role in the climbing case count. The number of Covid-19 tests being administered now is nearly double what it was in April and May. Is Trump right to say US does 'the greatest testing'? Is the pandemic getting worse in the US? But the posi