Posted: July 20th, 2012 - 4:33pm by Doug Powell

Although 18 people were infected with the outbreak strain of shiga-toxin producing E. coli O145 in 9 states, no source has been identified.

In its final update, the U.S. Centers for Disease Control noted that four ill persons were hospitalized, and one death was reported in Louisiana.

Dates for patients' onset of illness ranged from April 15, 2012 to June 12, 2012.