A college student goes to the Student Health Center with an extremely swollen neck. The ad-vanced practice nurse determines that he has mumps. His roommate also is experiencing malaise and a sore throat
Which of the following defines these two students?
a. Mixed outbreak
b. Common source
c. Point source
d. Propagated outbreak
ANS: C
A point source outbreak involves all persons exposed becoming ill at the same time, during one incubation period. A mixed outbreak is a common source followed by secondary exposures re-lated to person-to-person contact. A common source outbreak refers to a group exposed to a common noxious influence such as the release of noxious gases. A propagated outbreak does not have a common source and spreads gradually from person to person over more than one incuba-tion period.
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