Public health experts are reevaluating guidelines for safe social distancing amid growing evidence that the novel coronavirus can travel farther than six feet under certain conditions. A team of infectious-disease experts argues in a new analysis that six-feet protocols are too rigid and are based on outmoded science and observations of different viruses. Other researchers say six feet is a start — but only a start, warning that more space is almost always better, especially in poorly ventilated areas indoors.

Here are some significant developments: