Case counts in New York City’s school system have moved steadily upward, too. The daily average of new cases reported last week in the public school system was 1,216, raising alarm among some parents.

“The health and safety of our students and staff is our top priority,” Jenna Lyle, a spokeswoman for the Department of Education, said in a statement. “We will continue to follow the science and adjust if needed, putting the health and safety of our students and staff first.”

Known cases are far lower than they were during the winter, when the state was first struck by the highly contagious variant of the virus, Omicron, and cases in city schools reached around 14,000 in January.

However, Denis Nash, an epidemiologist at the CUNY Graduate School of Public Health, noted that testing…