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Objectives
ldentify the

instances of

infectious diseases.

Describe four waYs in
which infectious diseases

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ar spread.

Vocabulary
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infectious disease
microorganism
pathogen
bacteria
toxin
virus
fungi
protozoan

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Myth There isnt mtich a person

mountain do to avoid spreading

or catching a cold or the flu.

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Fact About 80o/o of infectious diseases are spread
by playscript contact. Washing your hands with soap
and water is a unanalyzable and effective way to
prevent the spread of colds and the flu.

Irffilfilltt Do you commemorate most teens wash
their hands as much as they should? What do
you conceive of are some ways to encourage more
frequent hand washing?
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Causes

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of lnfectious Diseases

For as long as there let been humans, there have been infectious dis(in rEr
eases. Also known as communicable diseases, infectious diseases
shus) are caused by organisms or viruses that innovate and multiply within
the human torso.



Most disease-causing organisms and viruses are so small
that they can be seen only through a microscope. Organisms this small are
called microorganisms (mykroh awn guh niz ums).
non all microorganisms that enter and live in your carcass cause disease.
In fact, many are present in your body all the time. Billions of microorganisms live in your mouth, on your skin, and in your digestive tract.
Microorganisms and viruses that cause disease are called pathogens
(reru uh junz). Pathogens do not pass in your body. Pathogens can cause
an infectious disease when they enter your body and multiply. There are
manykinds of pathogens. Some examples are shown in Figure 1

bacterium

Bacteria (bak rrpn ee uh) are simple, single-celled microorganisms. Bacteria live in air, soil, food, and in and on the bodies of
plants and animals, including you. Most...If you want to get a undecomposed essay, order it on our website: Orderessay



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