U.S. Virus Cases Top 25 Million

Epidemiologists say the true number of infections is probably much higher than the official tallies. Even with much more widespread testing now than in the pandemic’s early months, they say, many people who have never experienced symptoms may not have been tested or counted. Ira Longini, a professor of biostatistics at the University of Florida,…

Do Curfews Slow the Coronavirus?

Maria Polyakova, an economist at Stanford University, has studied the effects of the pandemic on the U.S. economy. “In general,” she said, “we expect that staying at home mechanically slows the pandemic, as it reduces the number of interactions between people.” Updated  Jan. 22, 2021, 10:27 p.m. ET “The trade-off is that the reduction in…