-
single
case caused by an uncommon agent
-
large
number of ill persons with similar disease, syndrome or deaths
-
large
number of unexplained disease, syndrome or death
-
unusual
illness in a population
-
higher
morbidity & mortality than expected with a common
-
disease
or syndrome
-
multiple
disease entities coexisting in the same patient
-
disease
with an unusual geographic or seasonal distribution
-
multiple
atypical presentations of disease agents
-
similar
genetic type of agent from distinct sources
-
unusual,
atypical, genetically engineered, or antiquated strain
-
endemic
disease with unexplained increased incidence
-
simultaneous
clusters of similar illness in con-contiguous areas
-
atypical
aerosol, food, or water transmission
-
ill
persons presenting during the same time
-
concurrent
animal disease