CAMP PENDLETON (CBSLA) – An E. coli outbreak at training facilities in San Diego and Camp Pendleton has sickened more than 200 Marine recruits.

The Marine Corps Recruit Depot San Diego reported Wednesday evening that at least 214 of its 5,500 recruits were undergoing treatment for E. coli exposure.

READ MORE: Caught On Camera: Hancock Park Woman Robbed After Returning Home With Baby

The sickened recruits were stationed at both the MCRD San Diego and Edson Range, Camp Pendleton facilities.

READ MORE: Sheriff's Homicide Unit Investigating Fatal Shooting In Whittier

Of those sickened, 26 were considered new cases and 12 were receiving treatment at an off-base medical facility, MCRD reported.

Samples were being sent for testing to a lab at the U.S. Army Public Health Command in San Antonio, Texas to try and determine what caused the outbreak.

MORE NEWS: In-N-Out Burger Appears Defiant As Enforcement Of LA's Proof Of Vaccination Requirement For Indoor Dining Begins

“The command’s full effort is focused on caring for those recruits who are affected, ensuring we limit any spread of the illness, and identifying the source of the infection,” said Brig. Gen. William Jurney, commanding general, MCRD San Diego and the Western Recruiting Region in a statement.