San Joaquin County is experiencing a marked increase in the number of cases of campylobacteriosis, a gastrointestinal disease that is one of the most common causes of diarrhea in the United States.

County Health Officer Dr. Karen Furst said there were almost 100 more cases reported in 2010 compared with 2009 — 233 vs. 135 — and the rise that began last summer is continuing into this year.

San Joaquin County Public Health Services conducted a study to look for a common source and specimens were sent to the California Department of Public Health Laboratory for more specific DNA identification.

No common source of exposure was discovered.

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