Cases of flu are spiking across North Texas. On Monday, nearly 700 children were treated in the emergency department at Cook Children’s Medical Center in Fort Worth. On an average day, the emergency room sees 379 patients. The number of flu cases this year is set to surpass the past several years, the medical system said.

Just in the past 24 hours, the Cook Children's Emergency Department in Fort Worth has seen close to 700 patients.

Children's Health, which primarily serves patients in Dallas and Collin Counties, reports a spike as well. The healthcare system saw 783 flu cases last week, which is an 83% increase from the week before.

More than 650 students and staff are out sick in one North Texas district, forcing multiple schools to close. See which districts are affected.