Covid-19 infectivity tops 1.2 in four states

COVID-19 | Four states have registered infectivity levels above 1.20, far surpassing the national average and indicating that the Covid-19 situation is continuing to worsen.

The Covid-19 infectivity rate is measured by its effective reproduction number (Rt). An Rt above 1.00 indicates a growing outbreak.

As of May 17, the states with the highest Rt were...