Virology is a division of science, which concentrates on the study of viruses and organisms which act like bacteria, such as prions and viroids.

1. VIROLOGY

3.  Viruses come in an amazing
variety of shapes and sizes.
They are very small and are
measured in nanometers, which
is one-billionth of a meter.
 Viruses can range in the size
between 20 to 750nm, which is
45,000 times smaller than the
width of a human hair. The
majority of viruses cannot be
seen with a light microscope
because the resolution of a light
microscope is limited to about
200nm.

4.  Enteroviruses are small
viruses. The enteroviruses
that occur in the United
States include
coxsackieviruses and
echoviruses.
 Polioviruses are also included
in the term “enterovirus,” but
they have been eradicated
from the United States by
vaccination. In all, more than
60 different types of
enteroviruses have been
identified.

5. One main motivation for the
study of viruses is the fact
that they cause many
important infectious
diseases, among them the
common
cold, influenza, rabies, meas
les, many forms of
diarrhea, hepatitis, yellow
fever, polio, smallpox and
AIDS.