The flaviviridae viruses are
small and enveloped
with an icosahedral capsule,
and they use intracellular membranes
as part of their structure.
These are linear, single-stranded,
positive-sense RNA viruses.
A positive-sense RNA, meaning that
it functions as a messenger RNA.
You can see on the scanning electron
micrograph in front of you
presence of the flaviviruses,
which look roundish without significant
There are several medically-relevant
types of the flaviviridae
or flaviviruses which we think about.
One are the hepatitis C viruses,
and the others are a larger
group of arboviruses,
which are all of them vector-associated.
Vector meaning transmission via,
in most cases, a mosquito.
And the viruses in this group
are the dengue virus,
St. Louis encephalitis virus,
yellow fever virus,
West Nile virus, and the Zika virus.