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Published byPierce Johnston
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Infectious Disease Aka Communicable Diseases Caused by micro-organismsParasite – lives in/on and feeds on host
Pathogens Pathogens Bacteria Virus Fungi Micro-organismsEnter the body Multiply Cause disease Bacteria Virus Fungi
Bacteria Single-cell micro-organisms Release toxins ExamplesFood poisoning –bacteria in food Tetanus – bacteria on objects/soil Staph
Virus Smallest parasite Enter cells and take over MultiplyCause colds/ flu HIV
Fungi Not all are harmful Some cause rashesMushroom/ yeast/ mold/ fungi Some cause rashes Ringworm & athlete’s foot
Spreading Infectious DiseasePhysical contact w/ infected person Contact w/ contaminated object Environmental sources Contact w/ contaminated animals
Contaminated Animals Animal bites *Eating bad food*Rabies/ Malaria/ Bird flu HIV/ AIDS
Contaminated Object Most infections die quickly when exposed to airSome can live on objects Lice
Contact w/ Contaminated PersonSkin to skin contact Sneeze/ cough Cold/ STI/ flu/ chicken pox
Environmental SourcesFood/ water/ soil Lead poisoning/ food poisoning Fungi/ mold/ pathogens in water Old food left out Contaminated animals
Stages of Disease Exposure Incubation Period Prodromal PeriodAcute Stage Recovery Stage Convalescence Immunity
Exposure & Incubation Exposure = contactIncubation = growth/ maturation No signs/ symptoms Pathogen/ parasite grows and multiplies
Prodromal Stage Slight signs & symptoms Ex: achy/ sore/ tiredContagious!
Acute Stage Severe symptoms Most contagious Most affected
Recovery Stage Signs/ symptoms begin to decreaseTemperature is reduced Feeling better
Covalescence Infection is gone Still not quite 100% Can relapseNeed rest, sleep, healthy diet, antibiotics
Immunity Feel 100% Body has antibodies Cannot catch same infection
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