Infectious Diseases
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3. Kinds of pathogens a. Bacteria- food poisoning, strep throat and tetanus. PowerPoint PPT Presentation


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Infectious Diseases  1. Organisms that cause diseases are called pathogens 2. Infectious disease a. a disease that is caused by the presence of a living thing within the body b. pathogens have gotten inside your body and caused harm. 3. Kinds of pathogens

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3. Kinds of pathogens a. Bacteria- food poisoning, strep throat and tetanus.

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3 kinds of pathogens a bacteria food poisoning strep throat and tetanus

Infectious Diseases 1. Organisms that cause diseases are called pathogens2. Infectious disease a. a disease that is caused by the presence of a living thing within the body b. pathogens have gotten inside your body and causedharm.

3. Kinds of pathogens

a. Bacteria- food poisoning, strep throat and tetanus.

Some pathogens damage cells by producing a poison, also called a toxin.

b. Virus – cold, flu

c. Fungi – athletes foot, ringworm

d. Protists – malaria, African sleeping sickness, amebic dysentery (diahrea, nausea)


3 kinds of pathogens a bacteria food poisoning strep throat and tetanus

4. How pathogens spread

a. Contact with infected people

direct – kissing or shaking hands

indirect contact – someone sneezing or shaking hands

b. Soil – botulism ( from not washing vegetables well)

c. Food – cholera, dysentery

d. Water – cholera, dysentery (public water system tested to make sure levels are safe)

Well water or other water sources are not tested and you have a greater risk of

getting sick

e. Contaminated objects – cold, flu, tetanus (germs can live on chairs, desks, pencils, door knobs.

f. Infected animals – rabies (sick animals) , lyme disease (tick bites) , rocky mountain spotted fever (ticks), malaria and West Nile disease(spread by mosquitoes)


3 kinds of pathogens a bacteria food poisoning strep throat and tetanus

5. How to Prevent Pathogen spread a. Active Immunity (our own immune system)Some immune systems are stronger than others. Immunity – a body’s ability to destroy pathogens before they cause disease with the antigens ourbodies produceVaccination – process by which harmless antigens are deliberately introduced into a persons body to produce active immunity. b. Passive Immunity – antibiotics – chemicals that kill bacteria or slows the bacteria's growth of bacteria's that cause us to get sick


3 kinds of pathogens a bacteria food poisoning strep throat and tetanus

Noninfectious Diseases 1. Diseases that are not caused by pathogens.a. cannot be transferred from person to personb. not contagious 2. Allergies- when the body system is sensitive to a foreign substance in the body. Examples: mold, dust, some food.a. Bodies produce histamines 3. Diabetesa. Pancreas fails to produce enough insulin or the body fails to use it properly.b. Results in too much glucosec. Type 1- must take insulin shotsd. Type 2- controlled by diet and exercise4. Cancer- cells multiply uncontrollably over and over killing the healthy cellsa. Tumors may develop b. Causes – genetic or environment (carcinogen)Examples: nicotine, UV light, vinyl chloride, arsenic asbestosc. Treatment- drugs, radiation, surgeryd. Prevention- avoid carcinogens, eat healthy and regular exercise


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