INFECTIOUS DISEASE
DO NOW
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10 Weird Health Clues
CHAPTER 33 OPEN NOTE QUIZ
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On Page 972, answer questions 1, 3, 13-20, 23-28
HOMEWORK DUE TODAY
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Read 35.1
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Answer Questions 1a, 1b, 2a on 1013
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Open note quiz
REVIEW HOMEWORK DUE TODAY
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List the types of organisms that can cause disease
• Viruses
• Bacteria
• Fungi
• Parasites
REVIEW HOMEWORK DUE TODAY
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What are the ways that pathogens can cause disease in their hosts?
• Some viruses and bacteria directly destroy the cells of their host. Other bacteria
release poisons that kill host cells or interfere with their functions
REVIEW HOMEWORK DUE TODAY
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What are the ways in which infectious diseases are spread?
• Coughing, sneezing, physical contact, exchange of body fluids, contaminated water
or food, infected animals
HOMEWORK DUE NEXT CLASS
•
Read 35.2
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How does the body fight infection?
EARLY DISEASES
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People believed that diseases were from evil spirits and curses
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“God bless you”
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1800s it was discovered that infectious diseases were caused from microorganisms that
disrupt normal body functions
• “Germs”
• Germ Theory for disease
“GERMS”
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No scientific meaning
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Caused by:
• Viruses
• Bacteria
• Fungi
• Protists
• Parasites
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All known as Pathogens
PATHOGENS
NAME
CHARACTERISTIC
DISEASES
Viruses
Nonliving, insert genetic
material into host cell; take
over host cell functions
Common cold, flu,
chickenpox, warts
Bacteria
Release toxins that interfere
with normal host cell activity
Strep throat, anthrax
Fungi
Infection on surface of skin,
mouth, throat
Ringworm, thrush
Protists
Take nutrients from host;
inflict damage to cells and
tissues
Malaria, intestinal diseases
Parasites
Wormlike; enter through
mouth; absorb nutrients
through intestinal tract
Trichinosis, hookworm,
elephantiasis
PATHOGENS
PATHOGENS
SPREAD OF DISEASES
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Different for different diseases
• Sneezing
• Coughing
• Physical contact
• Exchange of body fluids
• Infected animals
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Droplets in the air/doorknobs
• WASH YOUR HANDS!
SPREAD OF PATHOGENS
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Direct contact from host to host
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Hepatitis can be caused by the sharing of syringes and drug use
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Contaminated water/food
• Infect digestive tract
HOMEWORK DUE NEXT CLASS
•
Read 35.2
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How does the body fight infection?