Nordic Workshop, case-control study for sporadic EHEC (VTEC) cases in the Nordic countries

Report from a workshop in Stockholm, Swedish Institute for Infectious Disease Control (SMI), 20 April 1999

image of Nordic Workshop, case-control study for sporadic EHEC (VTEC) cases in the Nordic countries

Case-control studies are important tools in modern epidemiological investigations of communicable disease outbreaks. The emerging pathogen, toxin producing Escherichia coli, has caused great awareness due to it’s potential to cause severe and even fatal illness. To be able to take action against the spread of toxin producing E. coli a Nordic workshop was organised. The objectives of this workshop were:

• Exchange experience about the EHEC situation in the Nordic Countries.

• Learn from other countries about EHEC case-control studies, in order not to repeat any badly constructed questions.

• Discuss the methodology in case-control studies of sporadic cases.

• Establish a Nordic model of action for EHEC outbreaks or increased number of cases.

• To encourage co-operation between the Nordic countries in conducting case-control studies.

• Discuss how to proceed with the co-operation between the Nordic countries concerning EHEC case-control studies and outbreaks.

This report summarizes the lectures given during the workshop and discussions. It is also included two examples of how a questionnaire could be designed.




Most E. coli bacteria that are found in the human intestine are harmless to their hosts, but Enterohaemorrhagic E. coli (EHEC) produces toxins and can cause severe disease in man. EHEC is responsible for a range of illnesses, which may be severe, and in rare cases fatal, particularly in infants, young children and the elderly. The EHEC strains can be divided into several O serogroups; the most important one associated with human disease is serogroup O157.


This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error