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Infectious DiseaseInfectious Disease
• Aka Communicable Diseases
• Caused by micro-organisms
• Parasite – lives in/on and feeds on host
PathogensPathogens
• Pathogens– Micro-organisms– Enter the body– Multiply– Cause disease
• Bacteria
• Virus
• Fungi
BacteriaBacteria
• Single-cell micro-organisms
• Release toxins
• Examples– Food poisoning –bacteria in
food– Tetanus – bacteria on
objects/soilStaph
FungiFungi
• Not all are harmful– Mushroom/ yeast/ mold/ fungi
• Some cause rashes– Ringworm & athlete’s foot
Spreading Infectious DiseaseSpreading Infectious Disease
• Physical contact w/ infected person
• Contact w/ contaminated object
• Environmental sources
• Contact w/ contaminated animals
Contaminated AnimalsContaminated Animals
• Animal bites
• *Eating bad food*
• Rabies/ Malaria/ Bird flu
• HIV/ AIDS
Contaminated Object Contaminated Object
• Most infections die quickly when exposed to air
• Some can live on objects
• Lice
Contact w/ Contaminated Person Contact w/ Contaminated Person
• Skin to skin contact
• Sneeze/ cough
• Cold/ STI/ flu/ chicken pox
Environmental Sources Environmental Sources
• Food/ water/ soil
• Lead poisoning/ food poisoning
• Fungi/ mold/ pathogens in water
• Old food left out
• Contaminated animals
Stages of DiseaseStages of Disease
1. Exposure
2. Incubation Period
3. Prodromal Period
4. Acute Stage
5. Recovery Stage
6. Convalescence
7. Immunity
Exposure & IncubationExposure & Incubation
• Exposure = contact
•Incubation = growth/ maturation•No signs/ symptoms•Pathogen/ parasite grows and multiplies
Recovery StageRecovery Stage
• Signs/ symptoms begin to decrease
• Temperature is reduced
• Feeling better
CovalescenceCovalescence
• Infection is gone
• Still not quite 100%
• Can relapse
• Need rest, sleep, healthy diet, antibiotics