No COVID-19 outbreaks have occurred in San Francisco schools since they reopened to in-person learning in mid-August, and case rates have remained steady among young children in recent months, even as the highly contagious delta variant has spread, according to data released Thursday by the Department of Public Health.

Just 13 city children have been hospitalized because of the coronavirus since the pandemic started in early 2020, and none are currently, officials said. Of San Francisco’s 118,000 children, 5,543 have had the virus, and none have died from it, according to city data.

The San Francisco numbers defy national trends that have shown large rises in cases and hospitalizations among school-age children overall during the delta surge. Nationally, communities with low vaccination rates — and no mask mandates in public spaces and schools — have seen skyrocketing pediatric cases…

“This data affirms that the health and safety measures we have in place — including universal masking, improving ventilation, providing (personal protective equipment) and requiring all staff to be vaccinated — are keeping our schools safe,” he said. The district requires staff to either be vaccinated or tested weekly, but nearly a quarter of school district staff have not provided their vaccination status to the district.

The data offers the first substantive look at what the full reopening of in-person instruction has meant in terms of coronavirus cases across the city, even amid the delta variant surge.