An outbreak of schistomiasis occurs when multiple people in a group develop acute schistosomiasis. Whether it is recognized or not depends on a number of factors.
Factor
Favoring Diagnosis
Hindering Diagnosis
exposure risk
high
low
exposure episode
same (shared)
different
symptoms
significant
asymptomatic
delay in onset
few weeks after
months or years later
contact between members of the group
close
none
medical care after the trip
coordinated
diverse
expertise of physician
knowledge of travel medicine
no knowledge of schistosmiasis
post-trip evaluations
several
none
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