A influenza strain with a history of hitting the elderly and children hard has returned to Minnesota, where 35 schools have reported outbreaks and at least one switched to online learning this week after 1 in 5 students turned up sick.
Cleaners at the Math and Science Academy in Woodbury were spraying disinfectant in classrooms on Wednesday after an outbreak swept through the charter school. The influenza virus primarily spreads through airborne transmission, rather than contact with contaminated surfaces, but school director Kate Hinton said she wasn’t taking chances after seeing illness knock out 145 of her 700 students…