Pathogens and Disease

Pathogen: is any organism that causes disease Disease: an abnormality caused by a pathogen that affects performance of vital functions and gives some diagnostic symptoms virus, bacteria, fungus, protozoa, flatworms, roundworms

Flat worm Round Worms Viral Bacteria Protozoan Ectoparasites Fungal

Pathogenic Diseases Pathogen Disease 1 Disease 2 Disease 3 Viral Common cold BacterialCholera Fungal Athletes foot Flatworm Liver fluke Round Worm Ascaris lumbricus EctoparasiteTicks ProtozoanMalaria

Viral  VIRUSES are the smallest of all infectious agents, averaging about 100 nanometers (100 billionths of a meter) in length. They have so few genes and proteins of their own that in order to reproduce they need to commandeer the machinery of the cells they invade. Flu HIV Phage Bacteria being attacked by phages

 Bacteria vary widely in size and shape, but tend to be at least 10 times larger than viruses, or at least 1 micrometer (1 millionth of a meter) long. They are single- cell organisms that reproduce independently. Bacterial Vibrio cholerae TB sufferer Mycobacterium tuberculosis

Protozoa Amoeba Anophales Plasmodium Trypanosoma  SINGLE-CELL PARASITES tend to be at least 10 times larger than bacteria, or about.01 millimeter long. Make up around 70% of all parasites.

Flatworm Tape worms may be up to 30 foot longTape worms may be up to 30 foot long Schistosoma: kills 1 million annuallySchistosoma: kills 1 million annually Tape worms infect over 70 million peopleTape worms infect over 70 million people

Round Worms Infects 25% of worlds populationInfects 25% of worlds population One female can produce 20,000 eggs/dayOne female can produce 20,000 eggs/day Hookwork incidence 800 millionHookwork incidence 800 million

Athletes footAthletes foot ConjunctivitisConjunctivitis Ring wormRing wormFungal

Ectoparasite MitesMites TicksTicks FleasFleas

Disease Transmission Contact: hair, skin, SalivaContact: hair, skin, Saliva Sexual intercourse: oral or fullSexual intercourse: oral or full Droplet: coughing, sneezing Droplet: coughing, sneezing Water or food: contaminated water, unwashed/uncooked foodWater or food: contaminated water, unwashed/uncooked food Vectors: fleas, mosquitos, mitesVectors: fleas, mosquitos, mites

Two Tactics: Prevent entryPrevent entry Kill pathogen after entryKill pathogen after entry – Immune system This is War