COVID-19 patients are filling more beds in Main Line Health’s hospitals, but whether it’s the new omicron variant or the delta variant that put them there, doctors largely don’t know. Genetic sequencing, the process that could tell them quickly, is in short supply in the region and nationally, public health experts, researchers, and physicians said. “We’re sort of in the dark clinically,” said Scott Dessain, an oncologist and professor at Lankenau Institute for Medical Research, part of the Main Line Health system. “Nobody would have said two or three weeks ago that we would need variant testing within a day to make important decisions for our patients.” To read the full story.