TribLIVE's Daily and Weekly email newsletters deliver the news you want and information you need, right to your inbox. Carnegie Mellon University officials announced Tuesday that the school will delay the start of in-person instruction for the spring semester until Feb. 15. “As part of our continuing (covid-19) mitigation efforts, we have decided to delay the start of in-person instruction by one additional week,” CMU spokesman Jason Maderer said. University officials said the decision was tied to the prevalence of the virus in the region. It marked the second time the Oakland-based research university has adjusted its calendar in an attempt to limit the spread of covid-19. The university originally delayed the start of the spring semester from Jan. 11 to Feb. 1, hoping to avoid the flu season and a winter surge of covid-19 infections.