Investigation to learn the source and/or mode is necessary.
#EXPOSURE X TRIAL KEY HOW TO#
If the agent is known but the source and mode of transmission are not known (example: Salmonella eventually traced to marijuana), then the health department does not know how to target its intervention. Because disease prevention and control measures are often aimed at interrupting transmission, such measures can be implemented if the source and mode of transmission are known. As in Answer 3, our primary mission is to protect the public’s health, so disease control and prevention measures should take priority whenever possible. Protecting and promoting the public’s health is our primary mission, even if it interferes with our ability to conduct research. The most important public health reason for investigating an outbreak is disease control and prevention. Factors influencing a health department’s decision to conduct a field investigation include some related to the health problem itself (e.g., severity of illness, number of cases, availability of prevention / control measures), some relate to the health department (e.g., “corporate culture” for conducting field investigations versus handling it by telephone, available staff and resources), and some relate to external concerns (e.g., public or political pressure).
The other methods listed occasionally detect outbreaks, but less frequently. Most outbreaks come to the attention of health authorities because an alert clinician or a concerned case-patient (or parent of a case-patient) calls.
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