640 likes | 772 Views
We are Not Alone. They are in the air we breathe. In our food. On our skin. -on everything we touch. They are. microorganisms. What are microorganisms?. (also called microbes). Microbes are small living plants or animals most of which are not visible to the naked eye.
E N D
They are in the air we breathe . . . In our food . . . On our skin . . .
What are microorganisms? (also called microbes)
Microbes are small living plantsor animals most of which are not visible to the naked eye. Some microbes cause disease or infection. 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% Pathogens 3% opportunists
The role of good microorganisms Marine & freshwater microbes form the basis of the food chain in oceans, lakes, and rivers.
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 alcohol enzymes organic acids many drugs
They are used in the food industry for producing: pickles cheese vinegar alcoholic beverages greenolives bread yogurt
Main Classes of Pathogenic Organisms: • Bacteria • simple one-celled organisms • At home within “climate” of human body • compose largest group of pathogens • 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
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
Oral Thrush: tongue
Candidiasis of Skin Typical red, slightly most lesions.
Cutaneous Fungal Infection: Tinea Versicolor Note: hypopigmented fungal lesions
Subcutaneous Blastomycosis: Manifested by subcutaneous abscesses in upper chest
Chromomycosis Deep fungal infection with granulomatous lesions.
More Oral Herpes healing stage
Neonatal Herpes Premature infant born with classic “cigarette burn” pattern of HSV infection.
Poliomyelitis (also called infantile paralysis) Note: deformed right leg
Measles (rubeola) Rash usually begins on face and spreads to trunk and extremities.
Mumps: Note edema to cheeks and neck
Viral Hepatitis Severely distended abdomen (ascites). Secondary complication from hepatitis.