Presentation on theme: "We are Not Alone They are in the air we breathe... In our food... On our skin..."— Presentation transcript:
We are Not Alone
They are in the air we breathe... In our food... On our skin...
-on everything we touch.
What are microorganisms? (also called microbes)
plants animals Microbes are small living plants or animals most of which are not visible to the naked eye. diseaseinfection Some microbes cause disease or infection. “good” organisms Many microbes are “good” organisms that help keep balance in the environment and the body.
What microbes lack in size, they make up in number. On the average human, there are about 100 trillion microbes.
Good vs. Bad Microorganisms: Microorganisms that cause disease (germs) are referred to as pathogens. Yeah, I’m bad.
Microorganisms that are harmless or beneficial are called nonpathogens.
Most microbes are considered beneficial or harmless. 87% beneficial organisms 10% opportunists Pathogens 3%
The role of good microorganisms Marine & freshwater microbes form the basis of the food chain in oceans, lakes, and rivers.
Soil microbes help break down wastes.
Humans and other animals depend on bacteria in their intestines for digestion and synthesis of vitamins including: vitamin B (for metabolism) vitamin K (for blood clotting)
Microorganisms have many commercial applications They are used in synthesis of chemical products such as: acetone enzymes alcohol organic acids many drugs
They are used in the food industry for producing: vinegar pickles cheese green olives alcoholic beverages yogurt bread
Main Classes of Pathogenic Organisms: 1)Bacteria simple one-celled organisms At home within “climate” of human body compose largest group of pathogens 2)Fungi: yeasts & molds Plant-like organisms that live on dead organic matter Grow best in dark, damp places
3) Viruses - smallest microbes acellular particles (not a complete cell) 4) Protozoa one-celled animals often found in decayed materials & contaminated water 5) Helminths parasitic worms caused by larval & egg infestations
Impetigo highly contagious bacterial infection
Extensive case of impetigo on underarm of baby.
Fetal Tetanus (note severe muscle contractions) Due to toxin production as a result of bacterial infection.
Diphtheria Note swelling in neck
Cellulitis An acute bacterial inflammation of connective tissue.
Lymes Disease hallmark “bulls-eye” lesion
Tiny deer tick vector that transmits lymes disease.
Candidiasis: Oral Thrush
Oral Thrush: tongue
Candidiasis of Skin Typical red, slightly most lesions.
Leishmaniasis (protozoan systemic disease) Severe nodular, disfiguring lesions transmitted by sand fly
Dracunculiasis (Fiery Dragon Worm) Found just under skin of human host. Causes blisters at site of infestation.
Ulceration from worm.
A fiery dragon worm emerges from leg.
Elphantiasis affecting left leg and genitals
Intestinal helminthes cause infestations in intestinal tract and abdominal organs such as the liver and spleen. Always in pairs.
Helminthes which have infested the liver. hepatomegaly and ascites
Intestinal Roundworms Mass of 800 worms removed from child’s ileum during autopsy
Loa Loa eye worm infestation in conjunctiva
Loa loa being extracted from under conjunctivia.
Hydatid cyst formed by tiny tapeworm that migrated to brain.
Summary Microbes are microscopic organisms About 100 trillion microbes live on the average human “Bad” microbes are pathogens About 3% of microorganisms are pathogenic Main classes of pathogenic microbes include: bacteria, fungi, viruses, protoza, & helminths