corrie disalvo diana duque kristin hopkins lizbeth londono marcela morado chapter 28 lessons 1 &...
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![Page 1: Corrie DiSalvo Diana Duque Kristin Hopkins Lizbeth Londono Marcela Morado Chapter 28 Lessons 1 & 3 7 th Grade](https://reader036.vdocuments.site/reader036/viewer/2022062500/5697bf9e1a28abf838c94811/html5/thumbnails/1.jpg)
Corrie DiSalvoDiana DuqueKristin HopkinsLizbeth LondonoMarcela Morado
Chapter 28 Lessons 1 & 3 7th Grade
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Infectious Diseases
Diseases caused by the growth of pathogenic organisms in the body
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Bacteria• A single-celled microorganism
• Abundant in air, soil, and water
• Harmful
• Rapid Multiplication
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Viruses
• Smallest known type of infectious agent
• One of the worst enemies (HIV)
• Unique Structure• Invades all forms of
life
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Rickettsias
• Way of Multiplying
• Its Location
• Transmission
• Examples– Typhus and Rocky-Mountain spotted fever
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Protozoans
• Single-celled organisms
• 30 different types • Its Location
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Fungi• Simple organisms
• Saprophytes
• Prefers dark and damp environments
• Invasion sites – Ex: ringworms or athlete's foot.
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Transmission
Spread of infectious pathogens
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People
• Direct contact– Ex. Hand shake, pregnant women to unborn
child
• Indirect contact– Ex. Cough, sneeze
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Animals
• Dogs– Rabies
• Mosquitoes– Malaria and dengue fever
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Contaminated Objects
• Examples– Eating utensils– Glasses – Toothbrush– Door knobs– Pencils– Computer mouse
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Environment
• Careless disposal of waste
• Careless handling of foods
• Pollution in air and water
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What’s wrong with this picture?
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Immune Response
Nonspecific
vs.
Specific Resistance
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Nonspecific Resistance
• Physical barriers– Mucus membranes and skin
• Chemical barriers– Tears, saliva, and acidic digestive juices
• Body cells– Phagocytes
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Specific Resistance
• Lymphocytes– T-cells– B-cells
• Antibodies– Macrophages
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Mission: Search and Destroy
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Prevention
Immunity and Immunization
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Immunity
• Active Immunity– The defense system the body develops to
protect one from diseases
• Passive Immunity– The temporary defense that an infant
acquires from its mothers
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Immunization
• Passive Immunization– Immediate, short lived protection
• Active Immunization– vaccination
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Test Your Knowledge
1. Mother to baby– Passive immunity
2. Flu vaccine– Active immunization
3. Acute poisoning treatment– Passive immunization
4. Hepatitis A vaccine– Active immunization
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Test Your Knowledge Cont.
5. Tetanus vaccine– Active immunization
6. Chicken pox– Active immunity
7. Measles, mumps, and rubella vaccine– Active immunization
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Common Sense Measures• Hand washing
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After using thebathroom
Beforehandling/eating food
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After petting cat/dog Aftercoughing/sneezing
After handlingmoney
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Common Sense Measures
• Good Nutrition
• Regular exercise
• Bathe or shower daily
• Cover mouth when coughing or sneezing
• Avoid contact with people who are sick
• Avoid sharing of utensils
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Come out, Come out Wherever you are?
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Quick Review
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