Church leaders who wonder how they might resume in-person worship now have to make that decision with less guidance from the Centers for Disease Control and Prevention. An updated version of the CDC advisory for houses of worship now omits a previous warning about singing and the risks of virus transmission that may go with it. NPR’s Tom Gjelten says conservative Christian groups pressed for the change. TOM GJELTEN, BYLINE: Scientists who study how the coronavirus is transmitted say it’s all about aerosols, the tiny droplets that come out in a spray when people cough or sneeze or when people sing. Dr. Donald Milton is an expert on viral transmission at the University of Maryland School of Public Health.