Subunit
Vaccines
/
Second
Generation
Vaccines
It
is
likely
that
in
near
future
the
whole
organism
vaccines
will
be
completely
replaced
by
subunit
vaccines
or
second
generation
vaccines.
For
example,
pili
from
bacteria
can
be
extracted
and
purified
for
stimulatory
antipili
antibodies.
This
would
inhibit
attachment
of
bacteria
to
host
surface.
Another
vaccine
of
this
type
is
that
for
pneumococcal
pneumonia.
This
vaccine
contains
23
different
polysaccharides
from
the
capsules
of
strains
of
Streptococcus
pneumoniae.
A
third
example
is
for
hepatitis
B.
This
vaccine
contains
fragments
of
hepatitis
virus
surface
antigens
isolated
from
the
blood
of
hepatitis
carriers.
