case definition

A Cluster of Botulism Cases in Uzbekistan

Investigation of a cluster of botulism cases among guests who attended a social gathering at a home in Uzbekistan on December 31, 2003.  Straightforward outbreak investigation case study with only 24 attendees and 8 foods, but addresses botulism as a possible bioterrorism agent.

 

Objectives:

Investigation: 
Outbreak
Country: 
Uzbekistan
Year: 
2005
Author (s): 

Richard Dicker

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Typhoid in Tajikistan

Investigation of an outbreak of several thousand cases of Typhoid fever in Dushanbe, Tajikistan in 1997 that resulted from inadequately maintained public water supply.

 

Objectives

After completing this case study, the student should be able to:

1.       list health problems common in countries with economic hardships, deteriorating infrastructure, and displaced populations;

Investigation: 
Outbreak
Country: 
Tajikistan
Year: 
2010
Author (s): 

Jeanette Stehr-Green

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Acute Renal Failure and a Long Night in Haiti

An outbreak of acute renal failure deaths among children in Haiti, eventually traced to paracetamol contaminated with diethylene glycol.

 

Objectives:

  • Describe the questions and decisions to be addressed before departing on a field investigation;
  • List the steps of an outbreak investigation;
  • List the components of a case definition;
  • Discuss the role of epidemiologic evidence in public health decision-making.
Investigation: 
Outbreak
Country: 
Haiti
Year: 
1997
Author (s): 

Richard Dicker and Linda Dicker

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Outbreak of Group A Pharyngitis in Louisiana

Investigation of an outbreak of Streptococcal pharyngitis traced to foodborne transmission at a school banquet. Case study requires use of Epi Info and two small data files.

 

Objectives:

Investigation: 
Outbreak
Country: 
United States
Year: 
1994
Author (s): 

Jeanette Stehr-Green and Richard Dicker

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An Outbreak of Gastroenteritis at a Hotel Banquet

 

Straightforward, thorough investigation of an outbreak among attendees of a company holiday dinner held at a hotel in Virginia in 2004. Case study addresses each of the steps of an outbreak investigation.

 

 

Investigation: 
Outbreak
Country: 
United States
Year: 
2003
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An Outbreak of Gastroenteritis Among Warehouse Workers

Investigation of an outbreak of gastroenteritis among workers who ate catered food while taking inventory of a warehouse.  Straightforward outbreak investigation case study.

 

Objectives:

Investigation: 
Outbreak
Country: 
United States
Year: 
2005
Author (s): 

Richard Dicker

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Brucellosis in Kyrgyzstan

Examination of the brucellosis public health surveillance system and analysis of data from that system.

 

Objectives:

  • Describe the key principles of public health surveillance,
  • Describe criteria for including a disease in a national surveillance system,
  • Describe the data flow of a surveillance system,
  • Discuss the advantages and disadvantages of disease’s case definition,
  • Summarize and interpret surveillance data,
  • Define incidence and prevalence of a disease and calculate the incidence rate.
Investigation: 
Other
Country: 
Kyrgyzstan
Year: 
2005
Author (s): 

Julia Ershova

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Gastroenteritis at a University in Texas

Based on an investigation of an outbreak of norovirus gastroenteritis among students at the University of Texas in 1998, eventually traced to a foodhandler who worked in one of the campus cafeterias.

 

Objectives:

Investigation: 
Outbreak
Country: 
United States
Year: 
2002
Author (s): 

Jeanette Stehr-Green

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No Fair Warning: An Outbreak Following the 1999 Washington County Fair

Large outbreak of both E. coli and Campylobacter traced to unregulated fairground water supply, 1999; another straightforward outbreak investigation.

 

Objectives: 

  • List the reasons to investigate an outbreak;
  • List and discuss each step in the investigation of an outbreak;
  • Describe the features of an appropriate case definition; and
  • Construct an epidemic curve.
Investigation: 
Outbreak
Country: 
United States
Year: 
2000
Author (s): 

Richard Dicker

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A Measles Outbreak in a Highly Vaccinated Population (“Measles in Burundi”)

An outbreak of measles occurred in health sector Muyinga (Burundi), several years into an apparently successful vaccination program.  This case study addresses estimation of vaccine coverage and vaccine efficacy in the field.

 

Objectives:

  • Discuss methods for estimating vaccination coverage;
  • Describe the difference between a convenience sample and a probability sample;
  • Describe the sampling method used in WHO-EPI surveys; and
  • Calculate and interpret vaccine efficacy.
Investigation: 
Outbreak
Country: 
Burundi
Year: 
1991
Author (s): 

Robert Chen, Bernard Morniere and Richard Dicker

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