Foodborne Illness Outbreak Database

This database provides summaries of significant food and water related outbreaks occurring since 1984 caused by E. coli, Salmonella, Hepatitis A, Campylobacter and other pathogens. Read more »

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Northern California Unpasteurized, Raw Milk Cheese 1997

In early 1997, there were two reported outbreaks of Salmonella Typhimurium in two neighboring, northern California counties. The first outbreak which involved 31 persons had peaked in February, 1997. It was caused by Salmonella Typhimurium var Copenhagen. The second outbreak which consisted of 79 persons peaked in April, 1997, and was caused by a non-Copenhagen variant of Salmonella Typhimurium. Most of the ill reported that they had eaten unpasteurized, Mexican-style cheese. Salmonella Typhimurium of a strain that matched the strains isolated from patients in outbreak #2 was found in milk used to make the cheese.

  • Outbreak began:
  • February 1997
  • Affected Country:
  • US
  • Affected States/Territories:
  • California
  • Organism(s):
  • Salmonella
  • Vehicle(s):
  • Dairy, Cheese, Unpasteurized, Raw Cheese
  • Molecular Results Available:
  • Yes
  • Test Results:
  • Unknown
  • Location(s):
  • Home
  • Brand Name(s):
  • Product Subject to Recall:
  • No
  • Total ill:
  • 110
  • Number ill by Case Definition Known:
  • Yes
  • Number Laboratory Confirmed Cases:
  • 110
  • Number Probable Cases:
  • 0
  • Number Possible Cases:
  • 0
  • Anyone Hospitalized:
  • Unknown
  • Number Hospitalized:
  • Unknown
  • Any Deaths:
  • Unknown
  • Number Dead:
  • Unknown
  • Any References:
  • Yes

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