LOS ANGELES—Los Angeles County elementary schools will able to resume in-person instruction as early as this week thanks to dropping coronavirus rates, with a formal announcement expected Feb. 16, but Los Angeles Unified campuses will likely remain closed as the teachers’ union demands vaccinations before returning. In-person instruction has been unavailable to the vast majority of the roughly 1.5 million students in public and private schools countywide since March 2020, but the state permits elementary schools to reopen as soon as counties reach an adjusted average new daily case rate of 25 per 100,000 residents. According to the Los Angeles County Department of Public Health, the county will reach that milestone Feb. 16 when the state releases its weekly update of case rates for counties statewide. The news means that schools could be permitted to offer in-class instruction for students in grades TK-6. All schools wishing to reopen must submit …