WASHINGTON — As of Aug. 22, the number of Cyclospora cases potentially linked to Taylor Farms de Mexico, S. de R.L. de C.V., a business unit of Taylor Farms, Salinas, Calif., has increased to 609, according to the Centers for Disease Control and Prevention. However, it is not yet certain if all cases are part of the same outbreak.

The cases come from 22 states: Arkansas, California, Connecticut, Florida, Georgia, Illinois, Iowa, Kansas, Louisiana, Minnesota, Missouri, Nebraska, New Jersey, New Hampshire, New York (including New York City), Ohio, South Dakota, Tennessee, Texas, Virginia, Wisconsin and Wyoming. At this time there have been 40 hospitalizations and no deaths.

Investigations in Iowa and Nebraska concluded the infections in those states were linked to a salad mix that Taylor Farms de Mexico supplied Olive Garden and Red Lobster restaurants, both of which are owned by Darden Restaurants. The C.D.C. said investigations are still ongoing to see if this explains the cases in other states. Officials in Iowa and Nebraska believe the contaminated product is no longer in the food supply in those states, according to the U.S. Food and Drug Administration.

Taylor Farms de Mexico has voluntarily suspended production and shipment of any salad mix, leafy green or salad mix components from its operations in Mexico to the United States.

The first cases of infection were reported to the C.D.C. on June 28, and the number of infections has grown since then.