MICROORGANISMS

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MICROORGANISMS
A short introduction to
and INFECTIOUS DISEASE
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Microorganisms
a tiny living thing
can be seen only with a microscope
usually single-celled
Bacteria
Mold
Etc..
Yeast
Algae
Etc.,etc..
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Germs
microorganism that causes disease
Infection
growth of disease organisms in the body of a
host
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Infectious Disease
contagious /communicable
can spread from one organism to another
disease can spread in three basic ways
air
water
direct contact
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Causes of Infectious Disease
Bacteria
Protozoans
Virus
Fungi
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Viruses Cause...

• Most bronchitis/chest colds
• Green/yellow nasal discharge
• Flu
• Most sore throats
• Ear aches and some sinusitis

.viruses clear up on their own - antibiotics
won't help!
Influenza Virus Flu
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Bacteria

• make you sick when they are parasitic (where they
  dont belong) or grow more rapidly than normal
• live in your mouth, nose and throat
• are necessary for normal body functions (like
  digestion)
• are one of the oldest living things on Earth
• most are good guys (helpful or harmless)

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Bad Bacteria Cause...

• Strep throat
• Some ear infections
• Some sinus infections
• Pneumonia

• Streptococcus Pneumoniae Bacteria
• Ear infections
• Meningitis
• Pneumonia

...these can be treated with ANTIBIOTICS
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Virus or Bacteria Who Knows?

• Let your healthcare provider decide!
• It is often hard to tell if illnesses are caused
  by a virus or bacteria

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Why do young children have more illness?
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Infection can result from sharing towels,
dishes,contaminated objects. Indirect contact
or skin-to-skin contact
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• Your hands carry many germs-you cant SEE them.
• Many people dont wash hands (they LOOK clean)

Light patches indicate germs carried on the hands
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So, boys and girls..
DONT
YOUR
without washing hands before and after the
dig!
PICK
NOSE!!..
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• Sometimes an illness is passed to others by a
  carrier (a person who has been infected by a germ
  but does not look or feel sick)
• may carry the germ in their nose, throat, or
  stomach.
• can pass the germ by coughing, sneezing, or by
  not washing their hands properly.

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CDC Quarantine Stations
Seattle
Anchorage
Minneapolis
Boston
Detroit
New York
Newark
Chicago
San Francisco
Washington DC
Los Angeles
San Diego
Atlanta
El Paso
Houston
Miami
Honolulu
San Juan
Operational Stations (18)
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This unit is intended to SHAREnot SCARE.
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Evolution and Ecology of Pathogens
Thanks to
Centers for Disease Control and
Prevention www.cdc.gov/ National Center for
Infectious Diseases
Martin Polz Massachusetts Institute of Technology