LAYTON — Four Davis School District high schools are transitioning to online learning amid a rise in COVID-19 cases, according to school district officials. Farmington and Viewmont high schools' transitions were announced Thursday by the district, while Layton and Bountiful high schools' transitions were announced on Friday. The district dashboard reports Farmington High School with 29 positive cases, Viewmont High School with 17 positive cases, Layton High School with 27 positive cases, and Bountiful High School with 16 positive cases. According to school district officials, all schools will return to in-person instruction on Monday, Jan. 25. The threshold for Utah schools to move to online learning was revised in December. For schools with 1,500 or more students and staff, an outbreak occurs if 1% of the school population contracts the virus. For schools with less and 1,500 students and staff, 15 or more reported cases is considered an outbreak. The revision states that instead of closing when the threshold is met, schools can implement a "Test to Stay" option or move to remote learning for 10 days following an outbreak.