Younger people in their 20s, 30s and 40s are increasingly testing positive for COVID-19, a marked shift from the early months of the pandemic when older adults bore the brunt of cases. The shift is especially evidence in states now seeing spikes in cases, including Florida and Texas. Experts attribute the rise in cases in younger adults to a variety of factors, including increased testing but, even more, large gatherings of people. … "I've seen bars and restaurants that look like it's New Year's Eve 1999, not a care in the world, nobody wearing masks, standing shoulder to shoulder," said Dr. James McDeavitt, senior vice president and dean of clinical affairs at Baylor College of Medicine in Houston.