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Unexplained Respiratory Disease Outbreaks (URDO)








Generate a Differential Diagnosis						Print
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										Generating the differential diagnosis is a key step when first investigating an outbreak of unknown respiratory illness.
Differential diagnosis
One of the most important initial steps when investigating an outbreak of unknown respiratory illness is generating the “differential diagnosis.” The differential diagnosis is a list of the **most likely infectious causes or etiologies of an outbreak**. Differential diagnosis also refers to the process of comparing how likely one pathogen caused the disease versus another.
Generating a differential diagnosis enables investigators to use time and resources most efficiently and effectively to determine an outbreak’s etiology.
The process helps focus:
Questionnaire development
Specimen collection
Laboratory testing
Empiric treatment regimens
Targeted urgent public health interventionsAlso, a thoughtful differential diagnosis ensures investigators consider all likely etiologies early in an outbreak investigation. This process makes it less likely that investigators miss or overlook an etiology.
Differential diagnosis spreadsheets
The spreadsheets below summarize information on the principal pathogens or groups of infectious agents known to cause respiratory illness.
Demographic and Epidemiologic Data [2 pages]
Summarizes information about host demographics and epidemiologic features of infection (e.g. incubation period, case fatality rate).
Clinical Information [2 pages]
Highlights information on clinical features of infection for multiple pathogens. Clinical features include unique laboratory findings and unique pathology findings.
Risk Factors for Disease [2 pages]
Includes information about known factors of disease, like specific occupations at increased risk or group settings that are often affected.Persons with disabilities having problems accessing the above files may call 1-800-CDC-INFO (1-800-232-4636) for assistance.
More informationInvestigate an Outbreak
Specimen Collection and Handling
Detect and Characterize the Pathogen
Prevent Disease Transmission
							
					
							Last Reviewed:  June 1, 2023						Source: 	National Center for Immunization and Respiratory Diseases, Division of Bacterial Diseases
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