In this outbreak, some 280 cases of severe diarrhea (and in some cases bloody diarrhea), primarily among young children, were seen on this US Territorial Island. Investigators felt that most of the cases were due to person-to-person contact [although it can be transferred via ready-to-eat foods when the foods are handled by an infected handler.]
Notes from the Field: Outbreak of Diarrheal Illness Caused by Shigella flexneri — American Samoa, May–June 2014
Weekly
January 16, 2015 / 64(01);30-30
Julia E. Painter, PhD1,2, Allison Taylor Walker, PhD1,2, Jarratt Pytell2, Motusa Tuileama Nua3, Siitia Soliai-Lemusu3, Eric Mintz, MD2, Ibne Ali, PhD2, Michele Parsons, MS2, Haley Martin2, Michael Beach, PhD2, Anna Bowen, MD2, Jennifer Cope, MD2 (Author affiliations at end of text)
On May 9, 2014, a physician at hospital A in American Samoa noticed an abnormally high number of children presenting to the emergency department with bloody diarrhea. Based on preliminary testing of stool specimens, Entamoeba histolytica infection was suspected as a possible cause. Shigella was also suspected in a subset of samples. On May 22, the American Samoa Department of Health requested assistance from CDC with the outbreak investigation. The goals of the investigation were to establish the presence of an outbreak, characterize its epidemiology and etiology, and recommend control measures. The CDC field team reviewed the emergency department log book for cases of diarrheal illness during April 15–June 13, 2014. During this period, 280 cases of diarrheal illness were recorded, with a peak occurring on May 10. Twice as many cases occurred during this period in 2014 compared with the same period in 2011, the most recent year for which comparable surveillance data were available. Cases were widely distributed across the island. The highest number of cases occurred in children aged 0–9 years. Across age groups, cases were similarly distributed among males and females. These patterns are not consistent with the epidemiology of disease caused by E. histolytica, which tends to cause more cases in males of all ages.