Colorado, along with much of the country, is experiencing a summer bump in COVID-19 infections, showing the virus has yet to fall into a seasonal pattern. Flu, respiratory syncytial virus and other common respiratory bugs typically start spreading in the fall and peter out by spring. In Colorado, the worst points of the pandemic fell in the fall and winter, but COVID-19 hasn’t disappeared in the warmer months, as flu does. Four years ago, at the beginning of the pandemic, scientists expected the virus would be well on its way to settling into a seasonal pattern by now, said Talia Quandelacy, an assistant professor of epidemiology at the Colorado School of Public Health. Now, they’re less sure whether COVID-19 will eventually do that, or if it can keep churning out new variants fast enough to remain active year-round, she said. “That’s one of the big questions in the field,” she said. Colorado’s most recent weekly wastewater data showed concentrations of the virus increasing in three-quarters of the 55 utilities statewide that supplied information.