Troubling spikes in coronavirus infection rates were reported on Friday in several U.S. states, mainly in the South and West, a day before President Donald Trump was due to preside over an Oklahoma campaign rally that will be America’s largest indoor gathering in months. Wall Street jitters over a resurgence in COVID-19 cases as states moved to reopen long-stifled commerce and ease social-distancing measures helped drive down major U.S. stock indexes, reversing earlier gains. Experts say expanded diagnostic testing accounts for some, but not all, of the growth in cases – numbering at least 2.23 million nationwide on Friday – and that the mounting volume of infections was elevating hospitalizations in some places. “Clearly the cases are rising rapidly. It’s not just a matter of testing more,” said Dr. Murtaza Akhter, an emergency room physician at Arizona hospitals, noting the lag time between a positive test and […]