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Ir
Cuncer
Inf..trous?
Tumour virus
can
infect normal human
cells
and induce mu-
tation.
The
majority
of
etiological investigations showed
that
the
following
viruses
will
induce tumours:
EBV,
HPV|6,
HTLV and
HBV.
The
process of mutation is related to
manY factors
including
age,
sex,
endocrine and immunity situation, heredity
of
the
host,
the
carcinogenicity of the
virus and
etc.
Virus
is
an external
factor
which
becomes
otperative
only
through
the
internal factors
of
hu-
man
body.
For
cancer
prevention, people should, therefore,
keep
good habit
in
daily
life,
pay
attention
to
physical
exercise and
proper
nutrition,
treat
chronic
diseases
in
time
etc.,
so
as
to
build
up
good
health
in
addition
to
the
prevention of
virus infections.
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16
