At least 68 people, including 18 that needed to be treated at hospitals, have fallen ill across 19 states in a salmonella outbreak that may be linked to cucumbers, the Centers for Disease Control and Prevention said on Friday.

Federal officials announced they were investigating the outbreak believed to be tied to cucumbers grown by Agrotato, S.A. de C.V. in Sonora, Mexico, and sold by SunFed Produce, which is based in Arizona, and other importers. No deaths have been reported.

The C.D.C. said it was working with public health and regulatory officials in several states, including the Food and Drug Administration, to investigate the infections.

The cucumbers were sold in the United States and Canada, according to the F.D.A.

SunFed recalled all sizes of the product described as “whole fresh American cucumbers.”

Craig Slate, the president of SunFed, said in a statement that the company “immediately acted to protect consumers.”

“We are working closely with authorities and the implicated ranch to determine the possible cause,” he said.