Since last week's recall of cucumbers across the United States and Canada, more cucumbers have been recalled and more people sickened with salmonella.

The U.S. Food and Drug Administration and the Centers for Disease Control and Prevention are investigating a multistate outbreak of salmonella typhimurium infections linked to cucumbers, the agencies said on Monday.

The CDC has issued a warning about a Salmonella outbreak linked to cucumbers from Sonora, Mexico, urging consumers to discard recalled products and take appropriate safety measures. The outbreak has affected 68 people in 19 states, with 18 hospitalised but no fatalities.