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There were new alarming signs that COVID-19 was spreading again in Los Angeles County, with officials announcing the highest one-day increase in cases not connected to a reporting backlog since August.

The county reported 1,745 new cases Thursday as well as 19 new deaths. It’s the latest evidence that after declining for several months, the novel coronavirus may be on the rise again in L.A. County and other parts of Southern California.

If the region does see another spike like the one it experienced during the summer, it would threaten efforts to reopen schools and businesses. Already, Southern California has fallen behind the Bay Area when it comes to slowing the infection rate, allowing places such as San Francisco and Silicon Valley to reopen more quickly.

“The high numbers of daily cases are very concerning because, as we have seen in the past, increases in cases lead to increases in hospitalizations and deaths,” L.A. County Public Health Director Barbara Ferrer said in a statement. “These increases impede our ability to move forward with reopening additional sectors and getting more children back to school.”

Read the full story on LATimes.com.