case definition

L-Tryptophan and Eosinophilia-Myalgia Syndrome ("EMS")

National epidemic of new syndrome in 1989 quickly traced to a commercial product. Case study addresses surveillance, bias, criteria for causation.

 

Objectives:

Investigation: 
Outbreak
Country: 
United States
Year: 
1990
Author (s): 

Leslie Swygert and Richard Dicker

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An Epidemic of Thyrotoxicosis

Outbreak with unknown etiology and mode of transmission, crossing state lines, 1985; a nice wrap-up study, but domestic U.S. focus.

 

Objectives:

  • Define and perform calculations of sensitivity, specificity, predictive-value of a positive test, and predictive-value of a negative test;
  • Describe the relationship between prevalence and predictive value;
  • Discuss the trade-offs between sensitivity and specificity;
  • List the principles of a good screening program.
Investigation: 
Outbreak
Country: 
United States
Year: 
1987
Author (s): 

Frederic Shaw and Richard Dicker

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An Outbreak of Hemorrhagic Fever in Africa ("Ebola")

Investigation of the first recognized outbreak of Ebola hemorrhagic fever, in Zaire (now DRC), 1976; a practical outbreak investigation

 

Objectives:

Investigation: 
Outbreak
Country: 
Congo, the Democratic Republic of The
Year: 
1981
Author (s): 

David Heyman and Wayne Brown

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An Outbreak of Enteritis During a Pilgrimage to Mecca ("Mecca")

C. perfringens outbreak among members of the Kuwaiti medical mission during the pilgrimage to Mecca, 1979; a very straightforward outbreak investigation in a defined population with only 3 foods.

 

Objectives:

  • Define the term epidemic;
  • Create and understand the uses of a case definition;
  • Draw an epidemic curve;
  • Calculate food-specific attack rates;
  • List the steps in investigating an acute outbreak.
Investigation: 
Outbreak
Country: 
Saudi Arabia
Year: 
1980
Author (s): 

Fred Hoesly and Virgil Peavy

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Epidemic Measles in a Divided City ("Texarkana")

Measles outbreak in a community on the border of two states — the Arkansas side with required school immunization and high immunization rates, the Texas side without required immunization and low immunized rates, 1970.

Objectives

•    Discuss the advantages and disadvantages of using a sensitive and/or specific case definition in an epidemic investigation;

•    Calculate vaccine efficacy and discuss its interpretation; and

Investigation: 
Outbreak
Country: 
United States
Year: 
1971
Author (s): 

 Philip Landrigan, Lyle Conrad and John Witte

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An Outbreak of Jaundice in a Rural County ("West Branch Hepatitis") ("Omegaw County")

Community outbreak of hepatitis A associated with glazed pastries, 1968; an outbreak investigation in a community.

Objectives

•    Define the term “epidemic,”

•    Create a case definition and explain its importance in an outbreak investigation,

•    Draw and interpret an epidemic curve,

•    Calculate an attack rate,

Investigation: 
Outbreak
Country: 
United States
Year: 
1970
Author (s): 

Virgil Peavy, Fred Hoesly

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Evaluation of the Salmonella Surveillance System in Baku Azerbaijan, 2006-2008

Background: According to the U.S. Centers for Disease Control and Prevention, 1.4 million people are infected each year with salmonella in the USA. During the 2006-2008 period, 1,333 cases of salmonella were registered in Azerbaijan, 98% were in children under 14 years. We evaluated the salmonella surveillance system to identify the reliability of existing surveillance data for salmonellosis from Baku, Azerbaijan.

Year: 
2009
Author (s): 

Shalala Huseynova

Presenter (s): 
Huseynova

Field Epidemiology Manual

The Field Epidemiology Manual provides a set of core training materials reflecting the essential competencies required by intervention epidemiologists.

 

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