A parasitic illness outbreak has been linked to iceberg lettuce in 15 states, according to US health officials. The Centers for Disease Control and Prevention has identified these states as being connected to the outbreak. The number of states tied to the outbreak has grown from nine to 15.

For more information on the specific states and the investigation, readers can refer to the Centers for Disease Control and Prevention. Further details on the outbreak, including the source of the contaminated lettuce, are available from the source.