INFECTIOUS DISEASE

DO NOW• 10 Weird Health Clues

CHAPTER 33 OPEN NOTE QUIZ• On Page 972, answer questions 1, 3, 13-20, 23-28

HOMEWORK DUE TODAY• Read 35.1

• Answer Questions 1a, 1b, 2a on 1013

• Open note quiz

REVIEW HOMEWORK DUE TODAY• List the types of organisms that can cause disease

• Viruses

• Bacteria

• Fungi

• Parasites

REVIEW HOMEWORK DUE TODAY• 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• 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

• How does the body fight infection?

EARLY DISEASES• People believed that diseases were from evil spirits and curses

• “God bless you”

• 1800s it was discovered that infectious diseases were caused from microorganisms that disrupt normal body functions

• “Germs”

• Germ Theory for disease

“GERMS”• No scientific meaning

• Caused by:

• Viruses

• Bacteria

• Fungi

• Protists

• Parasites

• All known as Pathogens

PATHOGENSNAME CHARACTERISTIC DISEASESViruses 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• Different for different diseases

• Sneezing

• Coughing

• Physical contact

• Exchange of body fluids

• Infected animals

• Droplets in the air/doorknobs

• WASH YOUR HANDS!

SPREAD OF PATHOGENS• Direct contact from host to host

• Hepatitis can be caused by the sharing of syringes and drug use

• Contaminated water/food

• Infect digestive tract

HOMEWORK DUE NEXT CLASS• Read 35.2

• How does the body fight infection?