The Sacramento City Unified School District reinstated its mask mandate Monday just two months after making face coverings optional.
School officials said the decision came after the Centers for Disease Control and Prevention designated the county as having high levels of COVID-19 in the community.
When counties enter this category, the federal health agency recommends masking in indoor, public spaces and on public transportation.
“We are following the science. We’re following the data,” SCUSD Superintendent Jorge Aguilar told local affiliate ABC 10. “This is a public health issue. We are part of a community.”
According to the CDC, the county is currently recording 283.49 new COVID-19 cases per 100,000 people every week.
Data from the district shows the case rate is currently more than seven times higher than when the mask mandate was lifted.
Dr. Peter Chin-Hong, an infectious diseases specialist at the University of California, San Francisco, told ABC News that cases in Northern California are rising for several reasons, the main being the spread of new omicron subvariants.
“The new generations of subvariants are looking so different from the original variants from Wuhan that the antibodies don’t recognize them as easily,” he said.
He described immunity from vaccination against the new subvariants as two levels of defense.
“I think of the antibodies as guards at the front gate that are a little bit sleepy that let the virus in,” Chin-Hong said. “But you have B-cells and T-cells so, once the virus is in, they’re like the guard dog that attacks. So, you get infected, but you won’t go to the hospital.”