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Viruses
What are viruses?
A virus is a small infectious agent that
replicates only inside the living cells of other
organisms. Viruses can infect all types of life
forms, from animals and plants to
microorganisms
 Viruses are too small to be seen by the naked
eye.
 Viruses are parasites. They can't multiply on
their own, so they have to invade a 'host' cell
and take over its machinery in order to be
able to make more virus particles.

viruses
Spread of Viral & Bacterial Diseases
Viral and bacterial infections are both
spread in basically the same ways.
 A person with a cold can spread the
infection by coughing and/or sneezing.
 Bacteria or viruses can be passed on by
touching or shaking hands with another
person.
 Touching food with dirty hands will also
allow viruses or bacteria from the intestine
to spread.
Illnesses/infections
caused by Viruses:
 Chicken
pox, influenza, common
cold, flu, ear infections, measles,
polio, HIV/AIDS, dengue
How to avoid infection
 Wash
your hands
 Shaking hands with someone who has
a cold is risky, so avoid rubbing your
eyes or nose afterwards.
 Food should be cooked or cooled down
as quickly as possible.
 Vegetables and meat must be stored
separately and prepared on separate
chopping boards.