A set of training materials for professionals working in intervention epidemiology, public health microbiology and infection control and hospital hygiene.
Need help with your investigation or report writing? Ask the Expert. Free advice from the professional community.
You can't make decissions on this page's approval status because you have not the owner or an admin on this page's Group.
a new disease or when at the beginning of an investigation it is usual
different level of case definition from very sensitive (suspect case) to
specific (laboratory confirmed case). Usually cases are temporarily
as suspect until laboratory results are known.
outbreak of botulism in Italy in 2004 two levels of case definition were
developed as follows:
A 'probable botulism case' was defined as:
- a person who had dined at restaurant A on February 22 or
2004 and - had experienced
diplopia, or blurred vision, or fixed/dilated pupils and - at least one of
following symptoms: dysphagia, dry mouth, dysarthria, upper/lower
weakness, dyspnoea, or severe constipation.
Those who met the probable
definition and had laboratory-confirmed botulism were considered
With the sophistication of laboratory methods and
availability of many diagnostic tests for a single disease some case
may become lengthy and resemble more a complex decision tree as for
WHO SARS case definition. The following is one of the WHO regularly
case definition during the SARS epidemic in the west pacific WHO region
SARS case: definition for public health surveillance
1. A person
presenting after 1 February 2003 with a history of:
AND one or
more of the following:
2. A person
with an unexplained acute respiratory illness resulting in death after
November 2002, but on whom no autopsy has been performed AND one or
the following exposures during to 10 days prior to onset of symptoms:
* Close contact means having cared for, having lived
with, or had direct contact with respiratory secretions or body fluids
suspect or probable case of SARS.
** Areas in which there are reported foci of
transmission of SARS are updated on the WHO website (http://www.who.int/csr/sarsareas/en/).
Current areas (1 April 2003) with reported foci of
Probable SARS case:
definition for public health surveillance
case with radiographic evidence of infiltrates consistent with
respiratory distress syndrome (RDS) on chest X-ray (CXR)
case of SARS that is positive for SARS coronavirus by one or more
case with autopsy findings consistent with the pathology of RDS
Exclusion criteria: A case should be excluded if an alternative
diagnosis can fully explain their illness.
You need to be logged in to post comments.
You can log in here. You can register here if you haven't done so yet.